As requested.
General
No 16:9 BG? :/Normal
00:06:286 (1) - Move the red sliderpoint to be in the middle of the slider?
00:25:942 (2) - Why is this not 1/2 longer? The sound on 00:26:631 seems stronger than the current end.
00:29:045 (1) - That curving seems a bit too much for me, smoothen it a bit?
00:45:597 (1) - The current curve looks weird and a bit confusing on first sight, maybe use this:
01:24:217 (2,3) - (nazi) Cover (3)'s Trail completely with (2)'s end.
01:39:390 (1) - I would split that up into multiple Sliders, since the 2cnd+ reverse are not really visible and for being the easiest diff in the set, that would be great.
02:45:597 (1) - ^
03:01:114 (1) - ^
03:51:804 (1) - You may want to use a spinner instead, for different scores, but finding a good ending is hard here IMO.
Hard
00:07:321 (4) - I'd add a NC here to underline the repeat in music/pattern.
01:05:252 (1) - Split this up into two sliders, like you did before?
03:10:424 (1) - Since this isn't "introduced" with a combocolor change, it's easily mistaken with a regular 1reverse slider (I did), maybe use a stream + kickslider instead?
03:42:493 (1) - ^
03:51:804 (6) - Again, Spinner maybe.
Insane
01:11:976 (6,7,1) - This felt wrong, because when taking spacing + optics into account, I'd expect (7) to have only one reverse, misleading into sudden misses. Probably remove two reverses and add a note on the blue tick instead.
01:32:148 (1) - It felt like this shape was out of place, since most shapes you use for longer sliders are either very basic or involve sharp movement (red sliderticks), you might want to adapt that.
03:09:045 (5,6,7,8,1,2,3) - I found that very unfitting in relation to the music. While this part here is overall pretty hard with lots of 1/4, 1/8 and jumps, this pattern is pretty simple, however, the music indicates rising tension with that rising "melody", I'd replace this pattern with single 1/4 sliderjumps with rising spacing, like you did just before, that would fit this part much better.Muzukashii
00:48:700 (244,245,246) - Use dons instead, the high-pitch isn't that loud by now and dons fit the drums better.
00:49:735 (250) - Big kat? Would be a good finish for the prev. kats and amphesize the finisher in music.
00:53:700 (267) - Move this 1/2 earlier? Flows better IMO.
01:06:286 (325) - You're such a bored person.
D
01:19:735 - this was a pretty long combo IMO, you might want to delete some notes to keep these small moments of rest, e.g. 01:24:217 (419) and/or 01:26:804 (435).
01:43:011 (518) - A don would fit nice here.
03:00:942 (81) - I'd remove this note to create more contrast between the previous and the following pattern.
03:44:562 (300,301,302,303,304,305,306,307,308,309,310,311,312,313) - This is pretty dense for a Muzu, consider splitting up one or both of the 5's to 3+1.
03:50:769 (344,345,346,347,348,349,350,351,352,353,354,355,356) - I'd really prefer to see a slider here.
Oni
OD+1? It would make some 1/6 patterns smoother to play and represent the difficulty of the map better.
00:15:597 (2,3,4,5,6,1,1,1,1) - kkkkdkdkd would fit better here, it's closer to the drums and fits better to the following kkd.
00:23:873 (2) - don, for consistency with the previous combo-end.
00:28:700 (1,1,1,1,1) - ddkdk? The extra kat feels unnecessary.
00:36:631 (2,1,2,3,1) - kddkd for some variety?
01:11:976 (2,3,4,1,1,1,1) - kkdkdkd would create a better transition here, IMO.
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Sorry Loctav, only things in your part to find. :p
Streams are hard but doable and they fit pretty well, good job.~Good luck.~