I accidentally hit Esc and it froze, just like promised :D
There's no "end" screen so I was puzzled when it suddenly stopped. (oh wait, I guess I timed out :D) Nope, I just clicked away the screen to fast multiple times now damnit.
A great start. This idea could be extended into a nice puzzle game. For example by adding plates that would activate or deactivate traps. Or levels where there are 2 cubes which mirror each other etc.
While lacking in the audio department and challenge, this game idea seem to hold one of the biggest potential I have seen so far.