Quick suggestion. You should probably edit any "invisible" elements down to 1 by 1. Sorry for the small, nearly pointless request.I do realize I should have edited them to a 1x1 file but the space saved is so minimal there's virtually no point in me going back to fix it. As for the track colours, everything is editable to a player's preference in the .ini file. I liked the tracks cyan; if you like them black, by all means change it. I thought it made it look very flat so I didn't go with black.
Oh yeah, I forgot. The blue slider border looks kind of odd with the combo colors. Maybe you could color the track blue to match? Or at least make the border black to match with the hitcircles.
Nice skin, plays well. Personally like the UI more than anything else. Looks like hticircles drew inspiration from Contease skinThe spinner is 1px off centre. Others and myself ended up finding it quite psychadelic so I left it as is. I also don't know what the skin you mention is but I'll be sure to look it up.
Spinner is a bit wobbly..could probably fix that
Again, thank you for all the comments.