GeneralMy difficulty sensors are tingling. The patterns are really long, e.g. 00:40:829~00:52:743. There is no 2/1 space between them. Now might be the time where you think "but isn't the 1/1 enough?" - Reason for having 2/1 gaps here is, that your main beat
is 1/1, like for a Muzukashii the main beat is normally 1/2, so it needs 1/1(+ some 2/1) gaps between its patterns.
I will help you with the first notes until the first kiai ends.
Notes00:13:594~00:23:807 - In this time-range the usage of gaps is good. You should use similar gaps in the whole map to ensure making it not too hard.
00:20:403 (17) - Maybe have a d finisher. Sounds better in my opinion and alternates nice.
00:26:786 (37,46,55) - These notes can be deleted.
00:27:212~00:38:275 - In general I suggest this patterns which are easier to play and where the up coming kats emphasize them-self more at 00:34:020.

00:42:743 (75,76) - You could delete note 76(kat) and change 75(don) to kat. It fits to the vocal but also ensures the difficulty not being too hard.
00:46:148 - Similar. Better delete this note. The whole kiai is mapped to 1/1 with some 1/2 without any break, which is actually pretty much for a Futsuu. Muzukashii carry normally so many notes.
00:48:914 - Delete this note and maybe change the patterns at 00:49:339 to your "beloved"(:p) d x kd x dk x d
00:56:573 , 00:59:977 and 01:00:190 such notes can be deleted as well to emphaisze up coming patterns more.
Well, as I said I won't mod the whole Futsuu. Also, I do believe it can be improved. Patterns are a bit inconsistent; having no real connection to each other. You have a vocal-beat based mapping, but the patterns often differ themself from other once. I think it would be not a bad idea to have some redo on it with some less notes and if possible less copy-paste patterns. You could use copy-paste every second kiai, that would actually work. But on all is questionable if you ask me. Too monotonically on a 4 minute song. Of course, this copy-past case would also apply to the other difficulties and should be, if possible, changed.
Hint: The gaps between patterns for a certain difficulty are defined by the main beat(snapping divisor) you are using for your difficulty. Gaps are in most cases 2-times(x2) larger or more than the main beat.
Kantan - beat: 1/1 & 2/1, gap: 2/1 & 4/1, etc.
Futsuu - beat: 1/1, gap: 2/1, etc.
Muzuka - beat: 1/2, gap: 1/1, etc.
Oni - beat: 1/2 & 1/4, gap: 1/1 & 1/2, etc.
Though, 1/2 is not really a rest.