First, you give us an awesome demo. Then, you make us pay for the full game. I hate it when people do that. I think you should make the whole game free. Only then will I be happy.
P.S. I found a bug. Sometimes, when I let go of the button (any button), the game will think I'm still holding it. For example, if this occurs with the left key, Viridian will keep moving left after I let go (to those who don't know, Viridian is the person you're playing). Can you fix that?
P.P.S. To those whom it may concern: The game is called VVVVVV because of the names of the crew members:
Did you notice that all of their initials are V? Also, since there are six of them, there are six Vs. Do you get it now?