It is a cool concept that has some potential. It reminded me of overcooked.
I ran into some bugs that are related. First one, the player character doesn't have to be grounded to be able to jump, the only need to be close enough to something considered the ground. This allows the player to stick to the ceiling and shot up walls like a rocket. The second bug is that if the player holds jump while on the ceiling, they will no-clip though the ceiling, lost to the void.