Good controls, competent opponent that feels like it is responding to what you are doing. level 4 doesn't work, opponent needs only one less lap than you to win, unless it is some sort of puzzle.
I would rather see that broken levels would be removed than left as part of the game.
Little too much done to be bare minimum but not much more than that. I think this is quite well done. Fact that this is clearly very unfinished shows, and that is reason why this can be awarded only few stars.