[Kantan]
00:18:124 (4,5) - You could move (4) to 00:18:348 and change it into k. And (5) to 00:19:019. I don't think this will be much harder if you do that.
00:21:034 (8) - I think that huge empty part feels weird and lets too much space out to do something. Move this to 00:20:810.
00:21:258 - Following that above you could put here a d then.
00:22:601 - Same as the problem I named on 00:21:034. A k here is fine.
00:29:765 - I feel that a circle (k) is missing.
00:33:348 (26) - I would move it to 00:34:243 - because I think Drumrolls aren't a good idea imo and since I guess you perfer keeping them let at least a bit space after the Drumroll.
00:35:586 (29,30,31) - Move (29) to 00:35:362, (30) to 00:36:258 and (31) to 00:36:930. That song works a lot with 1/2 thingys and it
can be used in case the Futsuu has a much higher Difficulty as Kantan (which is the case here)
00:43:198 (40,41) - swap them? sounds imo better.
00:49:243 (3) - Maybe move it to 00:49:019 ? Sounds better.
00:52:154 (2) - Personally I would let it out.
00:54:392 (5) - k? It's easier for beginner to swap with the keys and they learn it better. Also it's fine to emphasize the voice here.
01:04:243 (19) - You could move it to 01:04:019. And then add d on 01:04:467 and 01:04:915.
01:06:482 (22) - If you did the suggestion above move this back to 01:05:586. You're doing the same 1/1 break how I suggested on 00:52:154 (2) and it's better connected to the three circles previously.
[Futsuu]
00:02:004 (2,4) - k maybe? Sounds better
00:03:795 (6) - k here, it emphasize the voice here.
00:17:452 (35) - Maybe to 00:17:004 ? it feels imo easier and rhythmicer to play.
00:18:571 (39,40) - I think it's fine to move (39) one tick forward and (40) change into d. dk kd sounds very nice here and it's good playable for Futsuu.
00:21:258 (46,47) - That's up to you if you like to change that but I think (46) doesn't take part here for the rhythm. You could remove it and change the (47) circle into d because this part is a bit lower as (45) or (48).
00:24:840 (52) - This time is kinda awkward for a 1/2 double I think it sounds cleverer to move it to 00:24:392.
00:23:945 (51) - If you did that above this should be changed into d since k doesn't match up with the following double not well.
00:29:542 (64) - that 1/2 circle sounds weird imo, maybe replace it to 00:29:989 ? You also could change it into k if you like this idea.
00:34:243 (2) - I think you overuse k here a bit so better change it as d.
00:40:512 (6) - I would find d d k k d pattern here very nice :3
00:42:974 (12,13,14) - Maybe you could put a circle at 00:43:646 and change this then to dkdk?
00:46:333 (21) - Maybe you should only emphasize the voice here and let this circle out.
01:02:452 - Put a k here?
01:05:362 (34,35,36) - Swap them, STRG+G. That sounds much more logical to me.
01:05:362 (34,35,36,41) - k maybe?
01:16:333 (67) - ^
01:18:795 (75,2) - I think both do not really suit with k, use d instead.
01:25:735 (16,17) - Same what I said about 00:21:258 (46,47).
[Muzukashii]
00:17:228 (49,52,54) - How about to let them out? I think it's much better emphasized by the 1/2 notes which stay alone after removing the circles I said.
00:25:288 (80) - I think the flow pretty nice if you let this out, (79) standing alone fits better imo.
00:27:079 - 00:30:213 - Try this pattern:
http://puu.sh/8wFzy/99417252e0.jpg00:30:885 (101,102,103) - kkd shouldn't be here, that's a Taiko patter for Oni Difficulties, not Muzukashii. k triplet is fine here.
00:32:004 (107,109) - same reason as 00:25:288, plus this 1/2 pattern combo is quite long and should be splitted.
00:34:243 - 00:37:377 - similar to the suggestion at 00:27:079 - 00:30:213.
00:39:840 (136) - I don't think that 1/2 should mapped here.
00:44:989 (153,154) - Change (154) into d and remove (153), better flow.
00:46:109 (157,158) - remove (158) and change (157) to k, better flow and k sounds much better here as d.
00:53:273 (6,7,8,9,10,11) - Remove (7) and make (10) to d.
00:56:183 (17) - Remove to split that long combo.
00:59:765 (32,34) - Would remove them, again to avoid such a long combo, plus making a nice flow here.
01:03:348 (46,48) - To make a smoother 1/2 part I consider removing them.
01:05:362 (53,54,55) - Same as 00:30:885.