Wow, this is super creative! I've seen a few people do the "only one light" thing, but this is the only implementation I've seen where the one light thing actually affects the design on the game. The controls feel good, the animations are great, and it's all around a well put together entry.
One small thing is that you can still see the rest of the level just about even when the light isn't on it. When I was playing in full screen, I saw the level change from one to the other. If you managed to make it so anything outside the light radius was completely black, I think it'd sell the effect even better
Great job with this!
(if you have time to check out our game, we'd love that ^_^ )