Very original idea, with a ton of potential, and pretty clean presentation. The problem is, I think that ten days is simply not enough time to implement that ambitious of an idea, and the game gets bogged down with bugs.
For example- when returning from 2d world, half the time I end up without the floor under me, making me fall. I discovered that stopping for a second before touching a blue block helps, but that might be just my impression. A purple block also managed to get stuck halfway, next to a glass wall.
I'd gladly play this game after it's a bit more stable, though!