Cool idea! Reminds me of Line Rider. 

Maybe I'm missing something but is the only way to solve the first levels by clipping the ball through the wall? If that's the case I think it would have been better to start out with a very simple level to get the player used to the controls first. 

I eventually got stuck on around level 4 where no ball is visible. I thought it might be hiding in the walls but I was unable to find it.