I found this to be a nice game. I think you could have put sound effects from when the cars hit each other. They could have also been used on the gun. I am not good at these kinds of games, mostly because I have a hard time telling up from down when you go around the racetrack. The music is also quite nice. I just think this is done in good spirits.
It managed to be fairly realistic as well. There weren't a lot of cartoony things going on. Your drawings of the humans could be better. It's nice to have everything simple enough to understand easily. I'm not into racing games normally, but this was nice.