I dunno, I beat Chapter 1. Not that great as everyone is saying. Fun game. Is there a challege?, the puzzles just waste time. Flipping to 3D is getting tedious. It's so easy to pass an obstacle, you switch to 3D mode and pass it! And what's up with the doors?!, the doors anger me. There's like a door every 5 seconds. Sorry for my complaints, I'll leave the complimenting for others.
I'd give it about a 8.0 so far. I wish there was an option to make it extremely hard though.