It was good, nothing really impressive or original, but it was fun enough.
It makes me think that you should have used a better skybox. More types of roads and maybe things like ramps to make the game a bit more active, here it's quite simple as long as you avoid going to the edges. It would probably have made the game more fun if you made the deathbox like lava, this way you would be like your goal is to run from the lava. Also, some music would have been cool, even if it's just a simple 15 seconds loop it would have been better than nothing