Sounds neat. I'd suggest to create a tutorial section in the game so that everyone can familiarize better with the mechanics, especially the new ones.
I didn't see the wheels at first, I believe it's the same system that Crash Nitro Fueled uses, right?
On a side note, have you considered...
I think it might be a bit too big? I'd leave it as a "console" option for who plays it on a couch with Big Picture, and add a "desktop" smaller version so that it doesn't clutter the view (or maybe even better, add a scalable option).