Easy:
00:18:926 (1) - maybe give that spinner a normal clap AND finish hitsound at 90% vol? I think it fits the background music better
00:22:268 (1) - here i would also use the normal hitsounds at 90% vol, its a more powerfull part of the song, so it sounds better with more hearable hitsounds
01:24:491 (1) - same here for the whole kiai-time =)
00:56:713 (1,2) - they feel a bit strange here, everything else is more based on the background-beat while these sliders are based on vocals. That may be a bit difficult for beginners. At least it broke my combo at the first play ^^
Normal:
00:21:380 (1) - i'd start that spinner one tick later and make it one tick shorter. Instead of the current spinnerstart, set a hitcircle with clap and finish sound. AND since its the powerfull part again i think normal-hitsounds at 90% vol sound better (same as above ^^)
01:23:602 (2) - same with the hitsounds
01:41:399 (1) - add clap (seems like you forgot
)
Hard:
00:04:926 (3) - i set this slider one tick earlier, made it one tick longer and deleted the reverse-arrow, instead of that i added a hitcircle at 00:04:259 (1) think this goes better with the vocals and since its "Hard" it shouldnt be a problem =)
00:12:592 (3) - one tick shorter would match the vocals better.
00:15:259 (2) - ^
00:21:380 (1) - same with the hitsounds as in every other difficulty ^^ for the powerfull part of the song normal-hitsounds at 90% vol
01:23:602 (1) - ^
Insane:
Gerneral: same with the hitsounds as in the other difficultys, just use the normal-hitsounds at 90% on the powerfull parts of the songs
00:03:426 (8) - add hitcircle?
00:09:926 (6) - add 2 more reversearrows? "feels" better to me ^^