00:50:599 (29) - for Kantan, I'd rather move this note to 00:50:989 - and change it to don to better match the drum and it sounds more intuitive in this way.
00:39:278 (2) - You missed a finisher here? You added a finisher on the same spot for all other diffs but not here.
Same goes to 00:42:403 (9) - 00:45:528 (17) -
00:52:747 (130,131,132) - 00:58:996 (157,158,159) - 01:06:612 (189,190,191) - 01:12:861 (216,217,218) - the use of multi-colored triplets is not recommended for Muzukashii
00:29:899 (48) - I'd suggest making this as don instead since you're mainly using kat to emphasize the synth.