for M4
$M
[Normal]
00:27:300 Finish here sounds nice
00:43:500 Add whistle
01:17:400 ^
00:42:900 I prefer remove whistle here and add whistle at 00:43:500
00:47:700 Lower the hitsound here
00:55:200 (6) The slider doesn't fit, maybe change to slider+circle or circle only
01:06:900 (7,8) Lower the hitsound, and make (7)'s hitsound lower than (8)
01:09:000 (2,3) You sure it doesn't feel too crowded?
01:22:500 (6,1) Could make blanket
01:25:200 (2) Somehow the tick on this slider doesn't fit with the song. Change timing or change the slider
[Hard]
00:02:700 Whistle here for consistency
00:11:100 ^
00:15:900 ^
00:20:100 (1,2) Maybe don't stack these to make a better flow
00:31:200 (4,5) Create a blanket with these
00:20:700 Add whistle, then reduce the hitsound at 00:21:000 because it's disturbing
00:24:000 and 00:24:600 Reduce hitsound
00:37:500 ^
00:40:500 ^
00:57:300 The hitsound can be modified so the (1) sounds lower and until (4) sounds higher (how to say it.. simply put, like a ladder of hitsound)
01:06:900 ^ Here too
01:16:500 ^ And here
01:18:900 Change to whistle and remove whistle at 01:19:200
01:20:700 Finish here
01:11:700 (4,5) Can become a blanket too, just move the (3) as well
01:12:900 (1,2) Maybe don't space it too far (but it's not a big deal though)
01:22:500 (1,2) ^
01:25:200 (4) Make this slider to be having 2 tick
I'm amazed with the nice timing modification, good luck