00:23:458 & 00:26:201 - personally think the vocal could be mapped. Since you follow the vocal and instrument in 00:27:916 (71) ~ 00:33:401 (96) -, only missing notes for vocal here (00:23:458 & 00:26:201) will make me feel a little bit weird.
don't think it's necessary cuz:
00:29:116 00:30:401 00:30:487 - I'll suggest nerfing this section a bit by removing these notes, the difficulty gap between futsuu and muzu is a bit large imo
Also currently the patterns in 00:27:916 ~ 00:33:401 are continuous, but the continuous vocal starts on 00:30:658, so I think removing these would be nice for song representation too
do something like this https://osu.ppy.sh/ss/18659480/a079 or https://osu.ppy.sh/ss/18659481/1dac instead
00:58:087 - really minor suggestion but since this is the first instance of a 1/4 doublet in the diff, maybe change it to kk to make it easier for players to react to? x xx x is pretty tricky for beginners after all and adding color change on top of it feels a bit trol, whereas after players get used to the rhythm here you can use the final kiai to spice things up :3
00:59:716 (121,122) - could change to don to emphasize higher instrument pitch at 01:00:144 (123)
01:03:573 (138,139) - 01:04:258 (141,142) - 01:04:944 (144,145,146) - consider changing them to finisher to make consistent with 01:02:201 (132,133,134) -
01:04:944 (197,198) - 個人是覺得既然 01:03:573 跟 01:04:258 - 都放大音符了這裏不管小提琴個鼓點都下得更重不妨也弄成finisher能襯托得更棒一些摸魚摸魚
01:06:321 - this note should be finisher cuz you can clearly hear finish sound in song + to coincide other difficulties (expect inner oni)