It was put together well, but overall fell short as far as playability goes.
I didn't really have any motivation to keep driving; there were no rewards, challenges, handicaps, etc, to keep it interesting and healthily along that "difficulty curve". In fact, I felt it was just too easy.
This particular concept has been done more than a bit, but I feel your version has potential, if you added powerups/handicaps of some nature, or milestones to pass where the player gets some upgrade or another, you know?