Very gentle amount of punishment, just the way I like it. Controls are very tight, so are the levels - obstacles are placed not too sparingly, not too dickishly (is that even a word?) - once again, just right. Margin of player error seems to be very gentle - not too forgiving and not too punishment.
So what I mean to say - I really enjoyed the game, even though I don't play time attack/hardcore platformers on my own. Also some levels seem to have almost rythm-game like flow to them which I appreciate a lot.
Colour scheme switch is great, though it seems like not colour schemes are created equal. But hey, more options for the player is good, right?
Good stuff, I liked it quite a lot.