00:15:942 (15942|1,15942|0) - 01:10:070 (70070|6,70070|5) - 02:07:261 (127261|6,127261|5) - is this double intended? I think 3-2-4 chord is too hard considering hard diff.
00:18:112 - Shouldn't there be quads for cymbal? I'm assuming you simplified to avoid a density spike but you could still use quads outside of 1/2 "streams" imo (00:18:112 (18112|0,19133|2,20155|1) - )
00:34:453 (34453|3,34453|4,34453|1,34708|1,34708|3,34708|0,34708|4) - 00:36:495 (36495|4,36495|2,36495|0,36750|4,36750|2,36750|0,36750|6) - quad is too much for Hard diff, maybe reduce to triple 1/1 minijack is better for both consistency and playability
00:34:325 (34325|4,34325|2) - Should still be nerfed to a single imo. The pattern is pretty comfortably arranged but 1/2 chords are at peak density for this diff and there's also 1/4 stream. Too much to handle at once. I'd also move 00:34:453 (34453|3,34580|4,34708|3) - to 5-4-3 then to ensure it's also not too problematic for left thumb users.
00:34:325 - changed to single
00:34:453 (34453|3,34580|4,34708|3) - I changed the notes to 5-4-3 and adjusted the final triple's placement from the ring finger to the middle finger
00:39:559 (39559|2,39559|0) - is it better to change 2-4 col that you made 00:44:410 (44410|3,44410|5,44665|2,44665|4) - ?
00:45:048 (45048|2) - 00:53:219 (53219|1) - I think these note can be removed because you didn't add same cymbal sound at 00:49:133.
00:48:240 (48240|1,48750|0,49261|2) - these notes can be also 1/2 LN that you emphasized at 00:47:729 (47729|0).
00:57:942 (57942|6,57942|5,57942|2,57942|4) - this quad is too big size considering musical phase also breaks consistency that you made 00:53:857 (53857|2,53857|5,53857|0). I think it should be reduced to triple and (this is optional, my subjective idea) made quad at 00:53:857 for big impression.
suggestion - 00:59:857 - I would put a note here since you you emphasize vocals here 00:59:985 (59985|5,59985|6,59985|2) - with a triple, so I would probably put the single note in col 4 and i would move this 00:59:729 (59729|3) - over 1 col to col 5
Uhhh, sorry but I think this change does more harm than good. It would be more consistent to continue followinig emphasized piano sounds like 00:57:942 (57942|2,58453|3,58963|4,59219|3) - with 3 more LNs at 00:59:474, 00:59:602 (maybe rice here) and 00:59:729. Then the note at 00:59:857 is redundant since there's actually no consistent pattern for vocal around and focusing on it just this one time is confusing.
01:27:559 - Notice that percussion's rhythm in this section changes. It's easy to hear around this pattern 01:28:836 (88836|2,88963|3,89219|2,89346|3) - and it goes like this every measure till 01:39:814, except 01:33:687. I'm not sure if you intentionally focus on melody and ignore some kicks like 01:31:006, or that's just a mistake. But either way consider emphasizing kicks to express song's variety. You also probably need to move hitsounds accordingly, unless it's intentional.
01:35:729 (95729|3,95985|3,96240|3,96495|3,96750|3) - nice anchor chord however it violates RC and also too hard considering Hard diff. Try to avoid with 125 - 367 trill.
this is subjective but i think for 01:46:963 - 01:51:048 - I feel like it plays kinda awkward but like its barely noticable, so I would suggest charting it differently ex: you could do it like this but there probably a better way to arrannge it than this https://youtu.be/RY-KuI8GKoM
I think, the main reason of this pattern's awkwardness is that you tried too hard to figure out the exact snaps. I'm pretty sure this is just a 1/3 stream not played perfectly. And starting from 01:49:516 it sounds more like 1/4 triplets. More complicated things don't really make sense here, it's not a breakcore. Try approximating with those snaps, it'll make for a much more intuitive patterns (also ignore 1/2 kicks inside 1/3 streams, poly is too hard for this diff).
01:56:027 (116027|2,116091|3) - 01:58:070 (118070|5,118133|4) - these 1/4 notes feel inconsistent; in this structure, you ignored some main piano sound and emphasized with 1/1 snaps where have hitsounds.
02:43:644 (163644|0,163899|1) - 02:45:687 (165687|6,165942|5) - aren't these LNs too low to emphasize with LN? Also it is slightly inconsistent compared with other diffs.
02:49:389 (169389|2) - 02:50:410 (170410|4) - 02:51:431 (171431|4) - 02:52:453 (172453|2) - I think these notes are emphasizing too small kick sound, maybe remove these notes and making 1/1 triple minijack can give more impression for players.