All difficulties:
I don't like sample/volume changing timing sections that are placed directly on notes, since you get the wrong sounds when you click too early. Place the sections at least 1/4 earlier, as long as you inherit.
Normal:
A bit.. too hard, but fine otherwise.
Hard:
01:10:74 (3) - Hard to see that this is a slider.
01:13:26 (1,2) - What a weird pattern?!?
01:47:88 (1,2,3,4,5) - That pattern feels pretty cluttered to me
01:55:74 (1,2) - What the fuck
02:15:57 (2,3,4,5,6,7,8,9,10) - That pattern is pretty hard to read since it's so cluttered and the sliders perfectly overlap.
02:43:26 (1) - Ugly.
To be honest, I suggest removing this difficulty, it's cluttered and ugly :/
I like the two other ones, but this ruins it, sorry.
Insane:
01:27:74 (1) - repeat not visible
Also, add an easier difficulty.