Eh, I'm already here, so I'll mod it~
[Easy]
00:13:847 (3,4) - Easily avoidable overlap
00:48:458 (3,1) - Things are starting to get pretty fast by this point, so I would really recommend against this type of slider at this point. Earlier when things are much slower, I didn't see a problem, but now things are heating up and it'll be confusing as to when this is going to end.
01:12:458 (1) - Move this about 1/2 grid right. It's bugging me that it's not centered between the two sliders, hehe
01:43:772 (3) - Shouldn't this be at 01:43:650 - ?
[Normal]
This is pretty tough, and I know the song doesn't help, but mapping in smoother patterns instead of back and forth motions would help dampen this a lot. So stuff like 00:31:315 (1,2,3,4) - would be a lot easier to hit going in a smooth arc instead of going back and forth.
00:40:743 (1) - Waaay too soon after a spinner for this level of difficulty.
00:57:743 (4,1) - This is a pretty big jump for a Normal...
01:23:810 (4,5,6,1,2,3,4) - Reeeeally wary of this kind of mapping in a Normal.
[Taiko]
00:30:172 (198,199,200,201,202,203,204,205,206,207,208,209,210,211,212) - This string just sounds bad. Maybe just have a stream of d and use k with the synth hits in the music?
01:42:303 - Starting kiai here makes a lot more sense than where you have it now.
[Insane]
01:12:458 (1,2,3,4,5,6) - I really don't like the way this pattern flows at all. Seems random/forcing its way into staying in the corner.
01:25:143 (3) - Why is this here?
01:50:140 - It doesn't feel right finish this song off without actually clicking a beat here and at 01:50:384 - .
You might be better off renaming Easy -> Normal and Normal -> Hard.