The audio is the best :D :D :D So funny.
The game looks great and works perfectly, but it's the common car race that you can find in every game. I think it's the intention, then, it's ok. It has a very great thinks, like when you see the racing circuit before run on it.
The collisions make the game slowly and no enjoyable. Also, I think that 5 laps is to much for test and rate the game.
Good job.