Well made game! I would suggest letting the player jump even a few milliseonds after they leave a platform, makes the game seem more fair. (It's called coyote time)

Those spike hitboxes need some work :( Otherwise, great idea! Controlling one character at a time and using them to solve platforming puzzles could lead to some really cool level designs.

Nice idea. The boxes feel a bit floaty, but with some more time I could see this turning into something! 

cool game but i could figure out what is "only one" about this game