This is awesome! The controls would be a bit better if you'd jump with the up arrow instead of the Space and you would switch between the players in a different way, because needing one of your hands to the mouse leads to using the space bar and the arrow keys with one hand, and that is a bit uncomfortable.
The game is very good however, great concept and excellent level design.
If my first game was like this, I would be the happiest man alive.