Alright let's get started. Mod requested on my queue 
Bold: Unrankable/must fix.
Red: You should fix it, but it's up to you.
Italic: Suggestion. Feel free to ignore this if you don't like it.
Blue: Comment. Just putting this for fun
[General]
Add "Asumi Kana, Matsuki Miyu, and Ootsubo Yuka in the tags. Believe it or not they're the ones singing this song.
03:04:993-03:10:238 - not a good idea because this will be a distraction and players will mess up easily. if you ignore this, enable the epilepsy warning. i'm really worried that this will effect the player's mind if they do play this.
[Normal]
00:00:693 (1) - make this a NC. this is an unrankable bug.
00:04:049 (1) - add a finish to match at the beginning the vocals in the song?
00:05:727 (3) - same as above, but reduce the volume to 40 or 50%.
00:07:406 (1) - same as my 2 suggestions above, and curve this slider so that it'd blanket (3). like this.
00:27:546 (1) - try to make this symmetrical. i think it'd look nice during gameplay. something like this should be fine. you might not see a difference, but look closely. the 1st and 3rd bump are evened out compared to the last one, not to mention, the bumps will go in sync with the drums.
00:30:483 - add a circle with a clap to follow the drums?
00:37:616 (1,2,3,4) - i felt really uncomfortable when i reached this pattern. the twists and turns got me to the point that i can't take it anymore. i suggest that you re-arrange the notes like this. the flow would look smoother and it'll be easy to move during gameplay.
00:46:217 (1) - this spinner is too sudden to appear in a part like this. replace them for notes to follow the vocals, but if you ignore this, add a clap on the spinner for consistency purposes.
00:49:574 (1) - this is why i mentioned about the spinner appearing too suddenly. you might tire the player's arm or wrist when they have to spin. again replace the spinner for notes to follow the vocals, and same as above. add the clap on the spinner for consistency purposes.
00:51:042 (1) - add a finish at the beginning to match the cymbals in the song.
00:57:755 (1,2) - replace these for curved sliders for a smoother flow. personally i don't like to see straight sliders like this because they lack in flow and creativity.
01:03:630 (4) - add a clap at the end with the whistle. same reason as 00:46:217.
01:09:504 (3,4,5) - add finishes to match the cymbals in the song.
01:17:056 (4) - same as 01:03:630.
01:22:930 (3,4,5) - same as 01:09:504.
01:49:994 (3) - add a repeat on this slider to follow vocals accurately.
02:01:532 (1,2,3,4) - similar to 00:37:616.
02:10:134 (1) - same as 00:46:217.
02:13:491 (1) - ^
02:14:959 (1) - ]same as 00:51:042.
02:33:421 (3,4,5) - same as 01:09:504.
02:46:847 (3,4,5) - ^
03:10:343 (3) - replace the clap for a whistle at the end. same reason as 00:46:217.
03:12:021 (1,2,3,4) - same as 00:57:755.
03:18:734 (1) - add a finish at the end. it follows the cymbals in the song.
03:22:091 (1) - move this to x:224 y:76 so that the sliders' ends clear the other slider (align this to (4) and go up a bit).
03:23:769 (3) - this wave slider looks completely different compared to (1), so make this look like (1) for a better flow, if you ignore this, then make (1) look like this slider.
03:30:483 (3) - add finishes at each end. same reason as 01:09:504.
03:43:909 (3,4,5) - same as 01:09:504.
[Scorpiour]
disable the letterbox during breaks since popner has a SB in this song.
00:02:371 (3) - replace the finish for a clap, and add a clap at the end. yes it matches with the vocals, but that only goes well on "uu" and "nya". putting a finish here really bothers me and i find it unfitting in this part.
00:04:049 (1,2,3,4,5,6) - i feel that something is missing here. add finishes on when the singers say "uu" and add whistles on when the singers say "nya". i think it'll make a nice pattern during gameplay.
00:10:762 (1) - you forgot a finish here. add it to match the cymbals.
00:14:119 - add a circle to follow the piano?
00:17:476 (1) - ^
00:19:574 (2) - perhaps you can space this out. the overlap bothered me when i played this.
00:20:832 - same as 00:14:119.
00:24:189 (1) - same as above but at the beginning.
00:49:783 (3) - add a clap to match the drums in the song.
00:55:028 (4,1) - these 2 should be a NC. in other words make (4) a NC and remove the NC on (1). the lyrics change from these 2 notes.
00:55:867 (2) - if you follow the suggestion above, remove the NC on this because it focuses on the melody on this. the lyrics change from this note, but usually the NC changes when the note is placed on the 1st downbeat.
01:27:965 - add a circle to follow "uu"?
01:38:035 - same as 00:14:119.
01:41:392 - same as above with the finish to match the cymbals.
02:18:944 (2,1,2) - same as 00:55:028 and 00:55:867.
02:43:490 - why did you stop the rhythm? add a circle here to continue the rhythm, or you can replace (4) for a 1/2 slider to follow the instrumental.
02:52:038 - add a circle to follow instrumental?
03:35:518 - same as 02:43:490.
03:37:406 (5) - the clap on the slidertick is too loud. reduce the volume so that it can match with the other claps.
placement is fine, but the hitsounds needs more work. you should add more finishes and whistles to match the cymbals/vocals in the song.
[Collab]
Popner:
00:00:693 (1) - same as normal.
00:00:797 - add 4 more circles to follow the vocals in the song.
00:01:637 - ^
00:10:762 - add a circle with a finish to match the cymbals?
00:17:476 - ^
00:30:063 (5) - i suggest adding a slow down this this slider to follow the vocals.
00:30:902 - add a circle here to start the rhythm, and to follow the instrumental.
00:34:469 (1) - players would most likely hit this too late, so add a circle at the 1st downbeat where this note is.
00:37:616 - same as 00:10:762.
00:59:014 (4) - i understand that this is your mapping style, but for me, i'm not feeling to flow in this at all. move it so that there would be a gap between (3,4).
01:24:609 (1,2) - to challenge players, replace this for a stream.
01:27:965 - same as 00:10:762. if you ignore this, then move the break here because it follows the instrumental.
same comment about the finishes and whistles.
DJPop:
01:37:616 (5,6) - move these down to form a square pattern. if you ignore this, then i suggest that you make a shape out of this to make it fun for players.
01:44:329 (5,6) - for this one, space out these notes for a fun jump for players. if you ignore this, you should follow the suggestion above.
just change the back and forth patterns to different shaped patterns and it'll be fine.
Hinacle:
03:33:000 (3) - i'm not feeling the flow on this since this is a straight slider, so make this look like (1) for a smoother flow from the previous note.
03:37:616 (4) - This clap is surprisingly loud compared to the other claps. reduce the volume so that it'd match with the other claps.
Best part in the collab hands down.
I guess that's it. Just work on the hitsounds and you'll be fine. GL

Bold: Unrankable/must fix.
Red: You should fix it, but it's up to you.
Italic: Suggestion. Feel free to ignore this if you don't like it.
Blue: Comment. Just putting this for fun

[General]
Add "Asumi Kana, Matsuki Miyu, and Ootsubo Yuka in the tags. Believe it or not they're the ones singing this song.
03:04:993-03:10:238 - not a good idea because this will be a distraction and players will mess up easily. if you ignore this, enable the epilepsy warning. i'm really worried that this will effect the player's mind if they do play this.
[Normal]
00:00:693 (1) - make this a NC. this is an unrankable bug.
00:04:049 (1) - add a finish to match at the beginning the vocals in the song?
00:05:727 (3) - same as above, but reduce the volume to 40 or 50%.
00:07:406 (1) - same as my 2 suggestions above, and curve this slider so that it'd blanket (3). like this.
00:27:546 (1) - try to make this symmetrical. i think it'd look nice during gameplay. something like this should be fine. you might not see a difference, but look closely. the 1st and 3rd bump are evened out compared to the last one, not to mention, the bumps will go in sync with the drums.
00:30:483 - add a circle with a clap to follow the drums?
00:37:616 (1,2,3,4) - i felt really uncomfortable when i reached this pattern. the twists and turns got me to the point that i can't take it anymore. i suggest that you re-arrange the notes like this. the flow would look smoother and it'll be easy to move during gameplay.
00:46:217 (1) - this spinner is too sudden to appear in a part like this. replace them for notes to follow the vocals, but if you ignore this, add a clap on the spinner for consistency purposes.
00:49:574 (1) - this is why i mentioned about the spinner appearing too suddenly. you might tire the player's arm or wrist when they have to spin. again replace the spinner for notes to follow the vocals, and same as above. add the clap on the spinner for consistency purposes.
00:51:042 (1) - add a finish at the beginning to match the cymbals in the song.
00:57:755 (1,2) - replace these for curved sliders for a smoother flow. personally i don't like to see straight sliders like this because they lack in flow and creativity.
01:03:630 (4) - add a clap at the end with the whistle. same reason as 00:46:217.
01:09:504 (3,4,5) - add finishes to match the cymbals in the song.
01:17:056 (4) - same as 01:03:630.
01:22:930 (3,4,5) - same as 01:09:504.
01:49:994 (3) - add a repeat on this slider to follow vocals accurately.
02:01:532 (1,2,3,4) - similar to 00:37:616.
02:10:134 (1) - same as 00:46:217.
02:13:491 (1) - ^
02:14:959 (1) - ]same as 00:51:042.
02:33:421 (3,4,5) - same as 01:09:504.
02:46:847 (3,4,5) - ^
03:10:343 (3) - replace the clap for a whistle at the end. same reason as 00:46:217.
03:12:021 (1,2,3,4) - same as 00:57:755.
03:18:734 (1) - add a finish at the end. it follows the cymbals in the song.
03:22:091 (1) - move this to x:224 y:76 so that the sliders' ends clear the other slider (align this to (4) and go up a bit).
03:23:769 (3) - this wave slider looks completely different compared to (1), so make this look like (1) for a better flow, if you ignore this, then make (1) look like this slider.
03:30:483 (3) - add finishes at each end. same reason as 01:09:504.
03:43:909 (3,4,5) - same as 01:09:504.
[Scorpiour]
disable the letterbox during breaks since popner has a SB in this song.
00:02:371 (3) - replace the finish for a clap, and add a clap at the end. yes it matches with the vocals, but that only goes well on "uu" and "nya". putting a finish here really bothers me and i find it unfitting in this part.
00:04:049 (1,2,3,4,5,6) - i feel that something is missing here. add finishes on when the singers say "uu" and add whistles on when the singers say "nya". i think it'll make a nice pattern during gameplay.
00:10:762 (1) - you forgot a finish here. add it to match the cymbals.
00:14:119 - add a circle to follow the piano?
00:17:476 (1) - ^
00:19:574 (2) - perhaps you can space this out. the overlap bothered me when i played this.
00:20:832 - same as 00:14:119.
00:24:189 (1) - same as above but at the beginning.
00:49:783 (3) - add a clap to match the drums in the song.
00:55:028 (4,1) - these 2 should be a NC. in other words make (4) a NC and remove the NC on (1). the lyrics change from these 2 notes.
00:55:867 (2) - if you follow the suggestion above, remove the NC on this because it focuses on the melody on this. the lyrics change from this note, but usually the NC changes when the note is placed on the 1st downbeat.
01:27:965 - add a circle to follow "uu"?
01:38:035 - same as 00:14:119.
01:41:392 - same as above with the finish to match the cymbals.
02:18:944 (2,1,2) - same as 00:55:028 and 00:55:867.
02:43:490 - why did you stop the rhythm? add a circle here to continue the rhythm, or you can replace (4) for a 1/2 slider to follow the instrumental.
02:52:038 - add a circle to follow instrumental?
03:35:518 - same as 02:43:490.
03:37:406 (5) - the clap on the slidertick is too loud. reduce the volume so that it can match with the other claps.
placement is fine, but the hitsounds needs more work. you should add more finishes and whistles to match the cymbals/vocals in the song.
[Collab]
Popner:
00:00:693 (1) - same as normal.
00:00:797 - add 4 more circles to follow the vocals in the song.
00:01:637 - ^
00:10:762 - add a circle with a finish to match the cymbals?
00:17:476 - ^
00:30:063 (5) - i suggest adding a slow down this this slider to follow the vocals.
00:30:902 - add a circle here to start the rhythm, and to follow the instrumental.
00:34:469 (1) - players would most likely hit this too late, so add a circle at the 1st downbeat where this note is.
00:37:616 - same as 00:10:762.
00:59:014 (4) - i understand that this is your mapping style, but for me, i'm not feeling to flow in this at all. move it so that there would be a gap between (3,4).
01:24:609 (1,2) - to challenge players, replace this for a stream.
01:27:965 - same as 00:10:762. if you ignore this, then move the break here because it follows the instrumental.
same comment about the finishes and whistles.
DJPop:
01:37:616 (5,6) - move these down to form a square pattern. if you ignore this, then i suggest that you make a shape out of this to make it fun for players.
01:44:329 (5,6) - for this one, space out these notes for a fun jump for players. if you ignore this, you should follow the suggestion above.
just change the back and forth patterns to different shaped patterns and it'll be fine.
Hinacle:
03:33:000 (3) - i'm not feeling the flow on this since this is a straight slider, so make this look like (1) for a smoother flow from the previous note.
03:37:616 (4) - This clap is surprisingly loud compared to the other claps. reduce the volume so that it'd match with the other claps.
Best part in the collab hands down.
I guess that's it. Just work on the hitsounds and you'll be fine. GL
