I tested it, and i wanna give some feedback
In song selection, don't use transparent bg, it makes the text invisible with some backgrounds, and when not selected.
the difficulty bar of a song, is under the place holder where you intented it to be.
the text of song, in song select goes over the place holder for difficuly bar
the bar where you have modselect. random song. and something else, the image you used there makes the text invisble.
the letters in mod selection need some kind of border, because they are not readable.
the hp bar, is waaay toobig, it it goes toomuch into playfield. maybe try using a neon cyan blue bar without pic.
the hitcircles make the song not readable at some point. maybe try using this style
http://puu.sh/cABkc/664e3ac052.jpg sliders and hit circles
maybe make the cursor, neon cyan blue. but the color it's now it's nice aswell.
hope this helps make this skin better