Quite creative, but the fun is not there.
Well, I can't say I enjoyed the game. The atmosphere made the game feel rather monotonous, could be me but the hitbox seems a little bigger than the appearance suggests.
Being forced to control two characters at once as a single player is very difficult unless you're one of the rare people with excellent coordination and reflexes at the same time or simply practice a lot, which is unlikely for a puzzle game that people would just play through once and be done with it. So the game is no doubt more fun and easier to play if you get to play with a friend. Then again, the atmosphere isn't really there to make this worthwhile a two-player game.
A good attempt at creativity, but the fun level just isn't there.