Let's see.
[Kantan]
HP +1, I don't think that Beginner are THAT bad, and this is too easy to pass for beginner.
00:02:210 (2,4) - k
00:12:891 (1) - k, I don't really think that the d sounds good or does really follow the pattern before.
00:17:917 (1) - ^
00:24:828 (4) - I would avoid this Circle to set it here. Since the Rhythm at 00:23:571 (1,2,3) - mix 1/1 with 1/2, this Circle can be hard to hit for Beginner. I suggest to move it at 00:25:142. It won't lacks on rhythm feeling imo.
00:29:854 (3) - k
00:54:828 (1,2,3) - imo it won't be wrong if you move them to the next white Ticks. Because you may should follow more the BG Music instead the Voice.
Otherwise, delete at least 00:55:142 (2).
01:13:205 (3,4) - Change them to d. Sounds fine too and make it easier to play.
01:18:231 (3,4) - ^
[Futsuu]
00:02:838 - I don't get why you don't add a k here.
00:04:723 (1) - d
00:05:351 - circle with k
00:05:666 - ^
00:07:864 (4) - k
00:14:933 (5,6,7) - Maybe this?
http://puu.sh/1jupm00:28:597 (1) - Move it to 00:28:440, since it fits better with the Music.
00:31:739 (3) - k
00:43:048 (1) - d, but it's up to you.
00:43:362 (2) - remove it
00:44:304 (2) - k
00:44:933 (1) - d
00:47:289 (3) - Move it to 00:47:446.
00:47:760 (4) - delete it (this and the Suggestion above should be taken by you, since the transistion is bad here at (3) ).
00:48:545 (5) - K
00:53:100 (1) - k
00:57:341 (3) - Move it to 00:57:498.
00:57:812 (4) - delete it (Same reason as 00:47:760)
00:58:597 (5) - K
01:03:152 (1) - k
01:13:362 (3) - delete it, it's not really neccessary for the Futsuu..
01:18:388 (3) - ^ but you may keep it for a good Finish of the Diff
[Muzukashii]
The thing I immediately noticed is that the Diff has many many circles and in all respect, you really should delete some stuff. Mostly, when I suggest to delete the Circle, it's because it's too much and you probably should follow it. Feel free to ignore this advice, it's just my opinion.
HP -1
00:02:838 (6) - k
00:05:351 (12) - k
00:07:707 (20,22,24) - I consider to remove them.
00:13:048 (2) - imo you could delete it for a better rhythm feeling
00:13:990 (2) - ^
00:15:325 (7) - The Triplet is bad and could be easily removed.
00:15:404 (1) - k (if you follow the suggestion above)
00:18:074 (2) - remove it, same reason as 00:13:048.
00:18:545 (1) - k
00:19:802 (5,6) - remove them
00:20:116 (6) - move it to 00:20:273 for a better flow.
00:21:058 (2,3,4) - Also here, the triplet is not really neccessary and it sounds a bit too much. Remove the Circle at the blue Tick.
00:21:844 (5,6,7) - ^
00:23:100 (1) - remove it
00:23:257 (2) - k
00:24:828 (2,3) - k
00:23:414 (3) - remove it
00:23:807 (2) - ^
00:24:043 (1) - d
00:24:435 (2) - remove it
00:24:514 (2) - k (just if you follow the suggestion above)
00:25:299 (2) - remove it
00:25:613 (1,2) - d
00:25:927 (1) - D
00:27:184 (1) - k
00:29:854 (1) - D
00:30:168 (1) - ^
00:30:561 (2) - remove it
00:30:796 (1) - d (if you follow the suggestion above)
00:31:111 (1) - D
00:31:425 (1) - d
00:31:896 (1) - delete it
00:51:215 (1) - D
00:55:535 (3) - move it to 00:55:299 since I feel that it sounds good here.
01:01:739 (2,3,4) - d
01:01:817 (3) - remove it
01:03:781 (2) - D
01:03:859 (3) - remove it
01:05:744 (15,16) - remove it, the transistion from the circle to Spinner is good if you delete them.
01:15:953 (3) - remove it
01:17:446 (1) - ^ to avoid a long combo
[Oni]
01:04:723 (145) - K
[Inner Oni]
00:02:838 (7) - k
00:03:152 (8) - Move it to 00:02:995 and make it to k. It sounds good.
00:05:351 (15,16) - Same as the Suggestions before.
00:09:749 (11,12) - k
00:25:927 (1,2,3) - IMO you should delete (2,3) and add Finish on (1)
00:49:880 (2) - This sounds for me too much here. I suggest to delete it.
00:59:933 (2) - Same here.
Well, this is all I could find. MMzz did a great job as always. orz