Hello! I have some concerns regarding the spread of this mapset, more specifically the difficulty surrounding Ayyri's Muzukashii.
For starters, the note density already denotes something is not going too well:
Futsuu has a total of 85 notes, Muzu has a total of 181 notes, and Oni has a total of 204 notes.
Moreover, Muzukashii is significantly lacking of 3/2 and/or 2/1 breaks (the only 3/2 break is at 00:18:748 - 00:19:281 - and their respective 00:35:829 - 00:36:363 - at the ending )
I'm going to suggest some places in which you can delete notes in Muzukashii in order to balance the spread between Futsuu and Oni
[Ayyri's Muzukashii]
00:06:070 -
00:10:874 -
00:16:079 (71,72,73) -
(repeat for 2nd half)
00:23:151 -
00:27:956 (132,133) -
Moreover, you can make some additions in Futsuu to further balance the spread.
[Futsuu]
2/1 in Futsuu is supposed to be the main break element, not the main rhythm element. So you can fill some parts to have 1/1 rhythms more consistently, such as:
00:09:806 -
00:22:618 -
00:27:422 -
Same would apply in Kantan, as 4/1 is the main break element, while 2/1 should be the main rhythm accompanied with occasional 1/1 and 4/1 breaks.
However, since this song is significantly high BPM and our guidelines specify that they apply to approximately 180 BPM, I am more lenient about the Kantan and Futsuu issues. Still, Muzukashii doesn't follow your line of reasoning and as such, the spread gets imbalanced around it.
Let me know if you agree!