Pretty fun. Some small things:
Sometimes your rotation doesn't seem to be reset when you restart a challenge. I've ended up facing 90 degrees at the start line.
Not sure if it's different on controller, but on Keyboard, since the air controls and ground controls are the same, it's kind of annoying to have to immediately lift to keep from nose diving every time you catch a bit of air. Would it be possible to have an option to control them separately?