-Make sure all your backgrounds are 1024x768 or below (check F4)
-All difficulties should have the same preview point
-Touhou isn't needed in tags as it is already in the source, (also is source needed in tags)
-Don't normally see a Normal and a Normal+, I don't think you really need both
-Include some whistles on the beginning streams to make them sound more interesting (all difficulties but easy atm)
-Have kiai time start at 02:27:822 on every difficulty (and make sure it is snapped), end at 02:50:679 (make sure it is snapped)
-Make sure countdown is disabled on every difficulty
Easy:
The hitsounds could use some work...try and change the claps more so they follow more of a steady rhythm (some do now..but not all)
Lower the 01:20:322 timing section more (like in Normal)
Audio lead-in time isn't needed, but why not start it at the same place as the other difficulties
00:06:394 (1) - I would prefer if this didn't go so close to HP bar
00:27:108 (3,4) - don't overlap these on previous slider?
00:29:251 (1,2,3,4,5,6,7) - might be slightly hard for the easiest difficulty
00:57:465 (1,2) - try and avoid long repeating 1/4 sliders on easiest difficulty
01:39:251 (4) - I wouldn't have this in an Easy, make it a 1/2 repeating slider or something
Normal:
Needs alot more hitsounds added, add some more claps where they sound good etc (same for the rest of the difficulties)
00:06:394 (5,6,1) - make sure spacing stays equal
00:27:466 (1) - start at 00:27:644, end at 00:28:894
00:33:179 (8,1) - spacing
00:46:752 (2,3) - try not to make too many of these, they aren't interesting
00:54:966 (1) - 0.5x time doesn't fit
01:02:287 (1) - end at 01:03:537
01:26:752 (7) - new combo
01:39:252 (6) - I wouldn't really have this on Normal either
01:45:502 (8,1) - avoid anti jumps
01:54:966 (3,4) - spacing
02:19:609 (1,2,3) - don't have this go under previous slider
02:41:752 (4,5,6) - I wouldn't switch from 0.5x to 1x like this
Normal+:
To be honest I really don't think a difficulty like this is needed with a Normal and a Hard already...so not going to mod it atm
Hard:
00:18:537 (1,2,3,4,5,6) - don't have sliders overlap like this?
00:28:895 (3,4) - spacing
00:42:823 (5,6,1) - spacing is just odd...try and stay to one distance snap and only use jumps when they make sense
00:56:216 (9) - don't have stuff like this go under previous notes (same for any like this)
Ok most of my other comments will be about spacing/hitsounds so check over everything I have said and try and go through all the maps with 1 distance snap so it all makes sense (some jumps are ok)
Call me back after a few more mods and I will finish modding everything in detail