Hi~
First of all, I apologize for modding until now, but here I am~
[General]
I'm pretty sure you can't put Newgrounds as source, move it to tags

[Insane]
Maybe increase HP +1?
00:05:558 (1,2,3) - This jump breaks the consistency in this part, I'd suggest you reduce it or changing your structure of the other parts with the same rhythm,
00:28:173 (3,4,5) - I'd prefer to keep this part with a consistent spacing, an easy way to achieve that is moving the triple (1,2,3) a bit if you don't want to ruin your pentagon shape.
00:40:866 (1,2,3,4,1,2,3,4) - I'd suggest to begin this in a white tick (delete (6) in previous combo and move the whole part here), the beat is quite stronger there and would fit better, if you do, add a circle in 00:44:327 to fill the new empty beat. Also add whistles in the beginning of the sliders and the circle if you move them.
01:12:943 (1) - This spinner felt a bit weird for me
01:15:943 - Adding a circle here would be nice, this beat feels a bit empty.
01:18:827 - A circle here for a triple would fit nicely too.
01:37:173 (3,4,5,6,7,8,9) - Not too needed, but a smoothie stream could be better here in my opinion.
02:03:712 (3) - You're covering some piano hits with this slider, which breaks a bit your rhythm structure, keep following the piano here

02:05:558 (3) - ^
02:07:866 (4) - ^
02:24:250 (2,3,4) - How about reversing (Ctrl+G) each slider? The jumps here are quite excessive in comparison whit the rest of this part, by applying this suggestion you'll keep your jumpy pattern, but it won't be too excessive, and will be somehow similar to the next pattern.
[Hard]
00:10:173 - Map this break, the sudden stop feels a bit ankward :c
00:20:327 (1) - This part could be better being a circle and a 1/4 beat slider with one repeat, this allows to keep your rhythm based on the piano.
00:29:096 (5,6) - Move (5) around x:164 y:48 and (6) around x:276 y:88, to make a kind of regular shape, which would look better imo.
00:40:635 (1,2,3,4,1,2,3,4,5,6) - Add whistles in each white tick, this part sounds a bit quiet.
01:00:366 (4,5,6) - This part would play better if you begin it at 01:00:481, it'd feel more natural imo. also replace the last slider with a circle if you do.
01:11:443 (5) - You could move this around x:400 y:152 to make it look straight and nicer.
01:12:943 (1) - How about keeping this spinner consistent in all diffs and ending it in 01:12:943 (1).

01:17:673 (5) - Fix this placement D:
01:18:481 (3,4) - Swapping the placement of this would create a nice flow, this is, just swith (3) for (4) and viceversa.
02:06:134 (3) - Remove this slider and put a circle in 02:06:250, follows better the piano
03:38:096 (1,2,3,4,5,6,1) - I'd suggest you to make this part a bit cleaner, actually that looks very squeezed.
[Normal]
00:00:943 (2) - How about making this a 2/1 beat slider and keep the repeat, I think it'd fit better with the piano in the downbeat. Delete the note in 00:02:789 if you do.
00:08:327 (2) - ^
00:11:096 - As in Hard, map this tiny break :c
00:36:943 (1,2,3,4) - Try shortening this sliders to 1/1 beat, 3/2 sounds a bit weird as the background is being constant.
01:57:250 (4) - As in first suggestions for this diff, make it a 2/1 beat slider.
03:16:404 (4,5) - Move (4) around x:80 y:104 and (5) around x:72 y:172, this makes a smoother flow here, you may need to adjust a little the next note or the curve of (5) to keep spacing consistent.
03:17:558 (1) - Try to open the curve in the opposite side, in a way this leads better to (2) ,like this
That'd be all from my part, good luck o/