Hello, from challenge queue~
[General]
why is there "collab" tag? is it necessary?
Use tiny grid size, it will help you much to make your slider prettier
[Basic]
00:51:617 (1) - change whistle at end of slider to clap, it's better to make hitsound same as 00:46:428 (1,2) -
00:52:914 (2) - ^
00:50:320 (1) - change whistle at slider's start to slider's end, at 00:50:644 the sounds bit louder than 00:50:320
00:50:968 (2) - ^
00:58:104 (2) - not pretty enough, maybe something like this?
300,52,58104,2,0,B|375:19|467:141|415:205,1,240,0|0
01:09:779 (1,2,1,2,1,2,1) - er... maybe it is just me but it seems you overused whistle here, it's noisy.

Sugget to reduce some
01:47:077 (3) - make it neater
01:49:671 (3) - ^
[Frobe's Advanced]
01:43:509 (1,2,3,4) - the flow... dunno how to say it. First you make something like this
SPOILER
[/spolierbox]
but for the next pattern
[spoilerbox]

it's not good since you make it more to the right. Suggest something like this
if you use it, don't forget to adjust another notes
01:49:671 (7) - make this slider neater
[Taiko]
It's good but kinda plain. It seems focused to follow same pattern in many places, but I saw this can be more attractive with some variation
00:59:401 (2,1,2,1,1,2,1,1,1,1,2,3,1,1,2,3,1,1,2,1,1,2,1,1,2,1,1,2,1,1,2,1,1,2,1,1,2,1,1,2,1,1,1,1,1,1,1,1,1) - ugh... these notes. Please reduce some notes, I can't feel the flow at all
[Collab]
01:15:293 (3) - move this note higher, it'll make the pattern prettier

01:15:455 (4) - move this note lower
01:26:644 (1) - remove whitle at slider's start and slider's end, add it at reverse arrow. It sounds better
01:31:833 (1) - remove clap, it's kinda random D:
01:32:320 (4) - ^
01:49:022 (2) - change clap from slider's start to reverse arrow, it more follow the song
OK, that's all. Hope it useful, good luck~