Normal
00:19:728 (2) - why not try to make a more perfect blanket around 3 by moving the center point of the slider 4 grids up? c:
00:20:996 (4) - ^
nice diff.
Hard
00:36:418 (6) - make slider a neater blanket around 4? o.o like this: http://puu.sh/FC90
00:29:658 - add a note to fit rhythm
Insane
00:02:510 - add a note here to make a triplet? (so that it matches with parts like at 00:00:925 (3,4,5) - )
00:49:306 (1) - new combo? starts new line of vocal..i think..
01:18:038 (6) - add whistle at beginning of slider
01:19:728 (3) - ^
that's all i guess, nice song ^^ good luck