Cool mechanic. I liked the light/dark switching, and the appearing disappearing platforms. The controls were a little weird to get used to, but I managed. The acceleration/deceleration of the character was the hardest part for me. I kept over jumping and trying to correct and falling. Especially with the light switching it would have been nicer to be a little more forgiving with mis calculating a jump.
Overall though. Cool game. Nice theme. Great mood and design.
Cheers.