It was neat. However I could only play once, if I go Main Menu and start again nothing happens. At least I don't think so. Also one player, as soon as I start I get smashed into immediately and thus, can't really play because it's instant lose. Did you happen to put your physics in the "Update" function instead of "FixedUpdate"? That might mean they are being applied at my frame rate (which would be high) and thus is generating a lot of force in the rigidbody.