General
The blue combos are hard to see on the blue or black background. Either change the colour or add a skin to change the approach circle to white (not sure if that's possible).
For some reason, when the Beatmap by [DBF] appears, the background goes blank in-game. That doesn't happen in the editor. Hmm..
Need more hitsounds, I guess.
Easy
00:56:47 (1,2,3) - Looks weird because it's not aligned like every other note.
01:11:31 (1) - End at 01:12:84.
01:15:40 (1) - Move to 01:15:66 (1/2 forward).
Hard
Increase HP Drain Rate because there's so many single-hit combos.
00:24:49 (4) - New combo.
00:28:58 (7,10) - New combos.
00:30:63 (1) - Make shorter. Kill the next-to-last node on the slider and clean up.
00:36:26 (2) - End at either 00:36:77 or 00:37:03.
00:37:54 (3) - Make a slider like 00:35:75 (1).
00:38:82 (7) - Make shorter and start at 00:39:07. Then, add a note at 00:38:82.
00:50:84 (2,3,4,5,1) - Align to grid.
01:00:05 (1,1,1) - Move under the end of 00:59:20 (3).
01:17:70 (5) - New combo.
01:18:73 (8) - New combo.
01:20:01 (1,1,1,1) - Replace with a shorter spinner, like in Easy, followed by a break.
01:37:92 (x) - Create same pattern here as in 01:29:73 (1,2,3,4) and 01:33:82 (1,2,3,4).
02:01:45 (1) - Remove new combo.
02:01:97 (2) - New combo.
02:12:71 (1,1,1,1,1,1,1,1,1,1,1,1,1,1,1) - Move so 02:12:71 (1) is under end of 02:11:69 (2).
02:19:11 (2) - New combo.
00:28:58 (7) - New combo.