It's a good concept.
It' very good. I like the overall look and feel to it. The graphics are simplistic, but anything else wouldn't have looked as good. My only complaint is, I think your event handler (or whatever it is that handles keypresses), gets overloaded. It's very frustrating timing a jump only to die because I didn't really jump. Other than that, great game. The intro reminds me of Portal. 10/10 & 5/5