General:
-- That intro is irritating, cut it?
-- I think you need an Easier difficulty with a lower slider velocity
-- Album name usually goes into tags.
-- You don't need the tag "pop" there is a genre for that.
-- The preview time between Normal and Hard is different please make them the same.
Normal:
-- Delete the SB on this difficulty please, you don't map to the end so you don't need that x2 BPM warning.
-- Why does this difficulty have the same slider velocity as Hard? Some variation please, or perhaps an Easier difficulty.
00:34:863 (2) - Too far, place it in the same place as 00:32:968 (4) - ?
00:35:179 (3) - Place to the right of the previous combo (just so its not all in the same area)
01:25:073 (4) - Make a better shape?
01:37:073 (x) - Note? or 01:36:442 (2) - extra return?
01:38:337 (x) - ^
01:40:231 (x) - Note?
01:40:863 (1,2,3,4,1) - Spacing slowdown, why? Might confuse players for the easiest difficulty and it's not even a x0.5 section...
01:42:758 (1,2,3,4,1) - ^
01:44:021 (x) - Note?
01:50:337 (1) - You could probably make this a better curve.
01:52:863 (x) - Note. + New combo.
Suggested notes are to add to the rhythm you don't have to use them, it's just I found some of the sliders removed from the beat when on their own.
Hard:
-- Why are the combo colors different to Normal? Please make them the same for consistency at least.
00:32:011 (1) - Unsnapped spinner.
03:13:705 -- The x2 BPM warning comes too early, you expect it straight away but get a spinner then X2 remove the spinner perhaps.
03:16:231 -- The x2 section doesn't fit imo, for example see how fast 03:16:705 (1) - moves but there is no change in tempo, pitch (its a repetition of the last verse) or anything that warrants a x2 section. It just feels wrong. I'd recommend removing it actually.
That's all there's a couple of nazi issues I could have picked up on but they aren't entirely relevant, I'll come back and star when you've fixed the unsnapped thing