Such a cool concept. I do think the camera should switch between the players. Also some type of indication that tells you which player is currently selected. Another thing is that the platforming was a bit hard, the movement was linear so doing small tweaks wasn't possible. I think lowering the movementspeed and adding some acceraltion to the movement would be an good idea, so that you can make those small adjustments.
Otherwise a neat idea and a good game. I like the sounds and the visual effects! :D