I got the full game yesterday.
I could go as far as saying VVVVVV is one of the best games I've ever played.
Played it for almost four straight hours. In that time I beat the game and got all the trinkets. It's simple, challenging, addicting, relatively lengthy, has lots of replay value, and the soundtrack is phenomenal.
I know that there's just a two-level demo here on Newgrounds, but if it were up to me, I would give this the Newgrounds Tank Trophy for best game of 2010 right now.