Very fun! After getting used to the movement it definitely put me into a state of flow which is a great feat!
Only issue was colliding into the cpu while in mid air knocked me off a handful of times. If the tracks were a bit bigger I think it would solve the issue as the player would have more space if they are neck and neck with the cpu. Especially since there isn't much movement capabilities while mid air, it's hard to properly avoid your opponent in those tight spaces.
Overall nice work and very cool idea. I can see this being turned into a speedrunning game.