Nice game. I liked having the controls on screen before the game begins. However, I did solo play it with a keyboard and a gamepad, as I don't have another person currently to play it with.
With some more obstacles and different levels, it would be fun to chase each other around.
I think I ran into a couple of bugs though, it seems one of the balls knocked me back when it was close but didn't hit me, and when you're a spirit you cant pass through the blue platforms.
It would be nice to see a timer or a bar, which shows how much time you have left as a sprit.
Overall good job!