[Easy]
00:51:736 (4,5) - Small overlap with the slider that can be easily avoided
01:21:687 (1,2) - This is pretty ugly D:
The ending felt kind of anti-climactic with all that speeding up in the music and the simplification of the rhythms. I guess it's difficult to do considering how you mapped the rest of the difficulty, but maybe see if you can spruce it up a little bit?
[Normal]
00:33:478 (1,2) - Easily avoidable overlap
00:57:069 (4) - Maybe align the end of this with the 2 slider?
[Taiko]
01:13:211 (587) - This seems kind of dumb as it only gets two hits in instead of the three like the slider later on.
End your kiai
[Spec.C]
HP Drain -1 or 2? Feels a bit high for this kind of difficulty.
00:39:070 - This needs to be BPM 180. Adjust slider speed multipliers accordingly.
00:41:736 - This timing section won't be needed after that adjustment.
02:04:126 (5,6) - These should be stretched to the red ticks.
[Lunatic]
00:07:665 (4) - Whistle on slider body intended? Sounds like :<
00:26:502 (1) - ^
Blargh there's a ton of them all over the map. If you wish to remove them, please attend to them all.
02:01:764 (5,6) - Kind of weird that these were stacked instead of just contributing to the overall stream shape and with consideration with the rest of the mapping presentation
[Insane]
01:34:812 (1,2) - Maybe lower volume on these two?
I've love to see the easy improved a bit, but the main thing you need to change is the BPM on Spec's diff.