Fun game with a great challenge level. It starts out simple enough to understand the basic elements of the game, then slowly progresses at a rate which isn't too slow, but doesn't jump up in difficulty.
The idea of being the lone test subject is a bit over done with games like Portal, Shift, Time Fuck, and so on. There isn't a big focus on the story, so it didn't bother me too much. But the set up has become over done.
Keep up the good work!