[General]
That's actually Nitori Kawashiro's theme, isn't it? I would add a background of her instead of Reimu.
[Kantan]
00:01:740 - 00:13:044 - I strongly recommend to decrease the density of this section, it's quite similar to Futsuu. Just check the pictures out how that actually is:
Current Kantan part,
Current Futsuu part,
my suggestion how to change in Kantan00:18:261 (2,3) - That's quite unfitting to start with these pattern imo, suggesting to remove this note, make (3) afterwards to k.
00:23:044 (8) - k k works and sounds better to learn.
00:30:000 (18,19,20,21) - that potenially could be replaced with a Drumslider to have an alternative for something streamy, up to you.
00:31:739 - 00:44:783 -
This needs to be less density. That section of the song is extremely calm and really really should not be overmapped in any aspect. Remove
at least 00:32:609 (23,2,3,5,6,8,9,12).
00:59:566 (35,36,37) - Please leave them out. I hear and understand you're following the vocals here but is something which is really not necessary to do in a Kantan Difficulty.
01:02:174 (40) - having a more interesting rhythm wouldn't hurt and playing x o o instead of o o o is definitely more interesting.
01:03:913 (43,44) - swap them, that fits to the actual hitsound building more.
01:08:261 (49,50,51) - What about d d K?
01:10:000 (52,53,54) - ^, it emphasize these sections well.
01:11:739 (55,56) - Finishers here maybe?
01:13:479 (57,58,59,60,61) - either d d k x K (recommend) or d d k k D, k d d d K doesn't looks imo that good at all.
01:21:739 (70) - That's an awkward place to set the note, it kinda breaks the (current) flow here. Unless you're going to change the whole Kiai this wouldn't fit how you've mapped the Kiai so far. Move it back to 01:21:305.
01:22:174 (71,72,73) and 01:23:913 (74,75,76) - Same what I suggested on 01:08:261 (49,50,51).
[Futsuu]
00:31:739 - 00:44:783 - Again, this is way too much what should be mapped. That's barely acceptable for an
Oni Difficulty, but nothing below. Please remove 00:33:261 (32,34,36,37,43,45,49,51,53) for at least.
00:48:261 - 00:51:739 - I find this part is a bit too calm for the current pattern you've used for now. How about using this?:
http://puu.sh/cTw9p/b9f18eb9da.jpg01:05:218 (103) - Removing this note seems better to fit with your mapping structure here.
[Muzukashii]
00:01:740 - 00:13:696 - This section has except for one-two smaller parts the exact same pattern like your Oni Difficulty which is unacceptable. And compared to the Futsuu Difficulty this is way too much. Please add more breaks and smaller combo chains.
00:23:913 (21) - Considering to remove to split this more and having more emphasis on 00:23:479 (19,20,22,23).
00:24:783 (24,25) - Would change (24) to D and removing (25) afterwards.
00:37:174 (2,3) - Pretty bad filler which really don't contribute much into the difficulty. They should be removed.
00:39:131 (8) - ^
00:40:870 (13) - ^
00:43:696 (22) - ^
00:47:609 (36,39) - Also these just sounds like fillers which just prevents to have some ms of break time and to go into the next parts.
00:50:761 (48,49) - That really don't fit here, this looks more like to force a more difficult pattern and that isn't good to map like this.
The Oni Difficulties were fine - tho I really dislike how you've mapped from 00:31:739 - 00:44:783 but this can stay - but about Muzukashii and Kantan.. these Difficulties are unfortunately not ready to be bubbled for now. I haven't said everything which needs to be changed,
only the biggest issues has been said and should be fixed. There are similar issues through both Difficulties which you're going to fix hopefully. Beside of this I strongly suggest getting more Mods for your set.