Hello!
[Easy]
01:54:851 (1,1) - Adjust blanket on the 2-circles. It's slightly off.
00:54:851 (1,1) - I'm also going to point these out, but there's enough of a deviation here that I think the off-blanketing is intentional.
02:50:051 (3) - Blanket on the 2-circle? The easiest way to do this is to move 2 slightly down and tighten the curve on 3.
[Normal]
No issues here. Good job!
[Hard]
In general, I personally think the repeat sliders in this difficulty can be a bit confusing. Many of your sliders repeat once, but many also repeat twice, and this makes it a lot harder to tell when the player is supposed to release.
00:39:251 (5) - Why ;_;
Wouldn't it be easier (and cleaner) to use a single control point for this circle?
00:41:651 (5) - This shape is somewhat bothersome, especially since the player has to stare at it for a while. How about something like this instead?
You might have to adjust the SV to get nicer looking shapes in there, but a slightly faster SV shouldn't be a problem with a long slider like this.
00:58:001 (3) - Something like this would fit nicer, I think.
01:02:801 (3) - Nesting error.
Fix by moving the red waypoint up a bit.
02:33:251 (7) - Remove second repeat. The second repeat is unexpected, and you would be following the piano rhythm better if you removed it.
[Lunatic]
00:58:601 (1,2,3,4,5,1) - Move 00:58:751 (2,1) down for symmetry.
[Regou's Extra]
This one is too difficult for me to play through, sorry! I can't tell if there are actual issues with the map or if I'm just bad orz
I'll point out a few graphical things that you can consider fixing.
00:26:201 (2,3,4,5) - Maybe fix this square?
00:38:951 (10) - Curvature is deeper than curvature of preceding stream.
00:52:451 (1) - Tilt downwards to be consistent with the rest of the figure 8.
01:39:251 (1,2,3,4,5,6,7,8,1,2,3,4,5,6,7,8,9) - Might look nicer as a converted circle slider.
02:55:601 (2,3,4,5,6,7) - Pentagon pattern could be neater.
[General]
You might've noticed that pretty much everything I've pointed out is graphical. This is because the spacing, note placement, object selection, rhythm, etc. are all very solid, so great job!