aight lets do this
[Oni]
One of the first things that struck me when testplaying was the fact that throughout the whole map, you were making a mixed mapping. This trait disappeared after the kiai, which felt awkward to play.
00:06:736 (16) - This note differs from these two: 00:03:044 (2,9) - . Structurally, you'd be better off putting as d (consistency)
00:07:890 (22,23) - How about reversing those two notes? Pitch increases.
00:08:351 (24,25) - I'd say put big notes there because stuff but this suggestion is stupid
00:09:505 (30) - D is much more fitting for the drum than K is.
00:09:851 - Here, if you want to shorten a bit the break, you can add a d.
00:11:121 (37,38) - I think you can reverse these two, as the music's pitch goes down. 00:10:198 (32,33) - follows more or less the same rule, so you may change it as well.
00:12:967 (45,46) - These two notes are p much on an empty space. If you wish to keep these, I have two options: dd, or *d (* means deleting the note).
00:14:005 (50) - Moving this note 1/4 forward will break the continuity of the pattern and still be nice to play. Your patterns are not very elaborated (No 5+plets) so it's easy to have too much continuity on this part.
00:16:198 (62,63,64,65,66) - ddk d D. Two reasons: 1. You will have room for the big note. That's all. 2. Rhythmically, this way is less forced and goes towards your general rhythm you made in the past seconds.
00:16:890 (66) - to 00:20:121 (80) - it's literally the same as before so you can just copy-paste if it was copy-paste
00:20:351 (81,82) - Same as 45-46
00:20:813 (84,85,86,87,88) - I think it's more of a personal preference, but I'd see this quintuplet as ddkkd. That way, you get a kat rhythm like that:
http://i.chiyozel.com/hFhlTUx600:24:275 (1) - D, same reasons as above. (30 I believe)
00:27:967 (17) - I start to wonder if all my color switch suggestions are worth it
00:28:198 (18) - You can go with a deletion here and switch 00:28:313 (19) - to a kat.
00:28:890 (22) - You get consistent pitch with the three following kats in the song, ya'd be better with the kitty
00:31:082 (33) - Even with 00:30:044 (28,29,30) - at least so you get consistency here. Nothing really justifies such kat change
00:35:582 (52) - And this one can be deleted if you deleted 18.
00:40:890 (75) - Change to don, and add a kat at 00:40:659 - . This way, no awkward pause will be felt. It goes with your mixed mapping as well.
00:42:505 - Can add don here for the same ^
00:43:890 (88,89,90,91) - dkk k feels pretty weird to play, kkk d fits the general pitch of the song.
00:48:044 - Apply the thing 3 lines above. You can add variation if you wish.
00:53:236 (126) - Change this to don. dkdkk does not really fit with the i-don't-know-what-to-call.
00:55:544 (137) - Change to k for a smoother play on the pattern?
01:27:736 (277) - Change to D ? It feels weird to have a d in the middle of a big note-dominant quintuplet.
I did not mention more doublet suggestions, because you might not like the idea of it. I dropped a few so you could try some. Also, I feel like I oversuggested. LMAO
[Muzukashii]
I'd say that the main missing feature in Muzukashii is 1/4 triplets. You only use them in the kiai
00:08:351 (18) - Change as kat as you got the same thing in Oni
00:30:736 - and/or 00:31:198 - Add a note, the pause provoked by the lack of notes is awkward to play and flowbreaking.
00:39:275 (101,102,103) - Just a heads up, bicolor triplets are hazardous material in Muzukashii.
00:40:198 (106,107) - I think you can simply make it a kat at 00:40:313 - . Other points where you have 2x 1/2 but a vocal note on a blue tick may be fixed.
01:10:428 (197,198,199,200,201) - Playability is awkward
01:27:044 (249,250,251,252,253) - Same comment as Oni.
[Futsuu]
00:07:659 (12) - Maybe you could just change it to don to keep xox pattern consistency
00:27:044 - Add a kat here to avoid the awkward pause
00:30:736 - ^
00:34:428 - ^
01:22:428 (167,168,169,170,171) - Add 1/2 notes here to be consistent with the first half.
[Kantan]
00:24:736 (30,31,32,33) - I think these notes are very awkward in all possible aspects: You start outside of a downbeat, and you only have doubles. Make it at least like this, or any equivalent you deem good enough:
http://i.chiyozel.com/EN4x9NGo00:32:121 (40,41,42,43) - ^
00:41:351 (53) - Delete this note, and change 00:41:813 (54) - to kat, so you get not a combo of two triplets
00:48:736 (64,65) - ^
I'm over with that mod. Some points may be missed.