I love it, the visuals and feel are excellent. I think having the ball state be a button hold instead of a toggle would go a long way. Having to manage my state in a level design that is going for sonic Iike fluidity gets real clunky.
The addition of the extra modes after you clear the first level is really good, I almost wish it started with a looser fluid map like the race and then worked into the more technical quasi puzzle style the main level has.