First of all: great visuals and great idea, works very well !
One thing really that can be problematic (despite the absence of sounds, but you where alone and it's a Jam, so it's not a big deal) is that the camera in centered on the ball and not on the two elements at the same time. You can lose your cursor like that, and, obviously, kill yourself.
But hey ! The game is good despite this, nicely done !