It's Simon Says - in 3D! (okay, maybe that's not fair, but it's what I first thought of)
It was intuitive to play (even without mouse controls). Maybe a little too easy.. I think part of it was the color blocks are randomized so much, there was always a good chance I could move to the correct block before the timer ran out.
Neat concept though, I wonder how it could be expanded, like I could see people playing this on their phone while waiting around.