Insane
00:00:896 (1) - This backtracking from the end of this slider to 00:01:594 (2) - requires what I find to be an awkward movement - it isn't comfortable to play. I would recommend making the tail of this slider to rather point in the direction of the upcoming beats (of course, moving it to the right place for DS) (Here 00:03:687 (1,2) - the movement is flatter, so I think it's fine)
00:02:641 (5) - For neat purposes, perhaps you can place this circle somewhere in the path of this previous slider 00:00:896 (1) - (and move corresponding 00:03:338 (8) - )
00:06:303 (9) - ^ same thing with this previous slider 00:04:908 (4) -
00:13:280 (6,7) - I see what you're going for here, but I feel like 00:13:280 (6) - should not be here at all, including the fact that its tail is a major white tick which needs more emphasis. The empty hitsound just makes it more confusing, in my opinion.
00:20:257 (1,2) - Are you sure this is necessary? But just to avoid having the tail on the tick of emphasis, I think it's fine. I do advise you to perhaps change it into a different pattern, perhaps 2 circles, one on the head of 00:20:606 (3) - and a finish HS on the tail of the slider.
00:30:373 (8) - Begins on red ends on white, would be better if you switched this with the circle before it (00:30:199 (7) - ) and fixed the placement
01:01:594 (3) - Picky - make a bit more curvy to point to 01:01:943 (4) - .
01:04:908 (5) - Refer to what I previously said about these sliders
01:12:931 (5) - Also ^ (I'm not mentioning some other sliders that are like this on the timeline because they sound fine
Hard
00:14:850 (1) - Fix this so that the head, this head 00:14:850 (1) - , and 00:14:152 (2) - this head creates a triangle (unless you care about DS, then nvm)
00:30:024 (1,2,3,4) - These four sliders don't feel right at all (ticks) and the hitsounds to make them sound alright makes this a pretty weird part. You can place a circle after 00:29:501 (4) - , and so on with moving what is after it.
01:12:583 (2,3) - Same thing, I can see and hear it and determine when you do this, because it doesn't fit with both of my senses. ^
01:20:955 (2) - Though, sliders like this one is okay. Because anything else would be weirder
Sorry if my mod wasn't helpful. I could attempt modding normal/easy, but trust me, those mods would suck! I have no clue how to mod them
Here, I touched up the BGs if you want to use them