Thanks!
I didn't know about Pontypants' submission, I discovered the mechanic by accident when working towards another. I agree that the circle colliders were a bad idea, I originally used the circle colliders as a placeholder for a future sprite/player model, and at a later point just went with the circle idea anyway. (I did add a small box collider on top of each player with higher friction to keep players aligned on top of each other, shouldn't fall off if you line then up against a wall).
Anyways, thanks for your feedback! :)