From my modding queue~
[General]
I'm surprised AiMod doesn't mention this, but... there are 45 seconds of silence before the first note. I know that the skip button exists, but have you considered mapping the beginning / cropping the MP3?
[agu's Muzukashii]
01:35:596 - Add d? You normally end 1/2 snapped patterns on a white tick.
02:25:996 (322) - Add a finisher for consistency with 01:32:236 (140).
[Ono's Oni]
01:01:156 (2) - Delete? This is only Oni, so I think quads are enough of a diff increase.
01:01:276 (3,1) - d K, to reflect the vocals?
01:08:356 (3) - k?
01:08:836 (2) - Delete? Same reasoning as 01:01:156.
01:35:716 (2) - Delete? Same as above.
01:43:396 (1) - ^
02:35:236 (2) - ^
02:37:156 (2) - ^
[Inner Oni]
01:01:756 (78,79,80,81,82,83,84) - This stream sounds strange imo. Maybe use kkddkdk instead?
01:03:676 (90,91,92,93,94,95,96) - ^
01:13:036 (136) - Finisher, like you did at 01:09:196 (126)?
01:24:556 (195) - Finisher?
01:32:116 (240) - d?
[Grim's Ura Oni]
Well, it's true that most Infected Mushroom songs have 1/8 sounds. This song seems to be an exception, though. Simple 1/4 should work in most situations.
00:52:396 (19) - I don't think a 1/8 triple is needed here. A finisher would be a good replacement imo.
00:55:036 (35,36) - dk, to make the stream match 01:01:996?
01:00:196 (73) - k?
01:03:196 (94) - k, to make the stream match 00:54:316?
01:05:116 - I think you should just use 1/4 here. I don't hear anything particularly unique in the song.
01:08:716 - This 1/8 doesn't seem necessary, but it sounds nice. If you want to keep it, that's fine.
Good luck with ranking this!