Hihihihi I'm going to throw my suggestions down. c: Feel free to take it or leave it!
Normal
00:24:635 (1) - move the middle point a lvl3 grid up? aha, it's nazi, but it makes the slider looks nicer with (2).
00:26:635 (1) - move the middle point down a grid.
00:30:635 (3) - somehow shift it (down maybe?) so it doesn't overlap!
00:35:635 (3,4) - Consider combining these two into one slider instead?
00:48:635 (1) - Consider using a slider instead?
00:53:635 (2) - Try to have this not overlap with 1 or 3?
01:00:635 (1,2) - these should be spaced out a bit more vertically!
01:04:635 (1) - again, consider a slider instead!
01:08:635 (1,2) - I am imagining this, and 01:09:635 (3,4), 01:10:635 (1,2) would work better as sliders~
01:48:635 (2) - consider adding this as a note (with a finish?)
01:50:635 (2,3) - have each of these sliders one blue tick longer maybe?
02:08:635 (1) - again, consider making this a slider
02:12:635 (1,1) - Consider mapping this in instead of using sliders!
02:27:385 (4) - consider making this a single note, and then having the end of 4 be a slider that ends at 1!
02:32:635 (1,2), 02:33:635 (3,4) - make sliders?
Hard
00:14:635 (1,2,3,4) - These should reflect the previous 4
00:20:635 (1,2,3,4,5,6,7,8,1,2,3,4,5,6) - I don't necessarily like these jumps aha.
01:06:635 (1,2,3,4,5,6,7,8) - Personally these seem a bit messy, just my opinion~
02:08:635 (1) - consider mapping this in?
02:12:635 (1,1,1) - ^
Insane
00:40:385 (4) - whyyyy is this 1.75x :< the wya it is right now is a bit confusing. Keep it all at 1.25 (or 1.75, pick one I guess)
00:56:385 (6) - ^ and similar parts.
01:12:635 (1) - perhaps start the break here instead, or map it in.
02:08:635 (1) - map in?
02:12:635 (1,1,1) - ^
02:26:635 (1,2,3,4,5,6,7,8,9) - use same spacing as the next combo!
Other than these small things, a wonderfully made map. *star
(Also I'm going to push for a mod4mod request here as well~
Kou Ogata - The Primal Scene of Japan the Girl Saw Thank you in advance aha!~)