Hey, these are my suggestions.
Easy:00:37:307 (1,2,3) - distance between 1 and 2 is different from 2 and 3, suggesting to move 3 by 1 spot up, or to move 1 and 2 by 1 spot down
00:38:716 (1,2,3) - ^
00:42:413 - i think this kiai should be moved to 00:42:941, this way it would fix the "explosion" effect on the first beat, also suggesting to extend it all the way to 01:05:476 (the break)
00:44:350 (2,3) - some minor spacing issues, but it looks alright so it's not critical, suggesting to move (3) by 1 spot to the left and 1 spot down
00:45:758 (2) - if above change is made, suggesting to move it 1 spot to the right and 1 spot down to match the symmetry
00:47:871 (5) - new combo? else the spacing looks a bit weird
00:51:392 (1,2,3,4) - move these by 1 spot up so they don't overlap the next combo
00:59:843 (1,2,3) - might want to consider moving them by 1 spot to the left and 1 spot up to make nicer "arrow" shape the combo has
01:01:251 (5,6,7) - ^ but instead of moving 1 to the left, move 1 to the right
01:02:659 (1,2,3,4) - move them by 1 spot up so they don't overlap the next combo
01:16:744 (1,2) - move the sliders by 1 spot to the right, so the distance is the same between 2 and 3
01:19:209 (1,2) - move the sliders by 1 spot to the left to match the previous pattern
01:22:378 (1,2) - move the sliders by 1 spot to the left
01:24:843 (1,2) - move the sliders by 1 spot to the right to match the previous pattern
01:28:716 (1,2,3) - the distance between 2 and 3 is shorter than 1 and 2, suggesting to move 1 and 2 by 2 spots to the left to fix this (if you want to keep the 3 in the center)
01:30:828 (1,2) - if above change is made, suggesting to move 1 and 2 by 2 spots to the right to match the symmetry
01:56:181 (1,2,1) - the spacing between the slider and circle (1,2) is too big for an easy difficulty imo, suggesting to invert the both sliders and flip them like in
this picture
01:58:997 (1,2,3) - spacing issues, suggesting to move 1 by 1 spot up, 2 by 1 spot up and 1 to the left and 3 by 1 spot to the left to fix this
02:01:110 (1) - suggesting to move by 1 space down for it to have same spacing as the last combo and being in the middle and to remove the "new combo" from it
02:01:110 (1,2,3) - also spacing issues, suggesting to match the symmetry from an earlier combo, moving 1 by 1 spot to the right, 2 by 1 spot to the right and 1 spot up and 3 by 1 spot up
02:10:265 (1,2,3) - suggesting to move this combo (all three notes) by 1 spot to the right
02:11:674 (1,2,3) - suggesting to move this combo (all three notes) by 1 spot to the left to match the symmetry with the previous combo. This change makes these combo look more pretty as (1) in both combos don't overlap
Normal:Overall - suggesting to put circle size to 1 to make it a bit easier
Hard:01:26:603 (1,2,3,4) - suggesting to modify this pattern according to
this picture
01:34:702 (4) - move this by 1 spot down to match the symmetry
02:10:089 (1,2,3,1,2,3) - suggesting to move both combos by 2 spots up to make it more centered
Insane:Overall - suggesting to put circle size to 2 to make streams a bit easier to hit
00:50:159 (2,3,4) - 3 and 4 aren't stacking on top of 2, you should fix this by moving them by 1 spot to the left and 1 spot up
Also, gj!