A few problems
1. The steering sucks. I understand you're trying to make it realistic but it's annoying as hell having to take 5 seconds just to do a 15 degree turn.
2. Bad music - Lame, bland, generic rock music. The audio portal contains thousands of great songs at your disposal, use some of those.
3. No recovery time from getting hit.
I can get killed by the cop in literally about 4 seconds. Give me some kind temporary invulnerability every time I take a certain amount of damage to insure I don't get killed super cheaply.
Overall, fun simple game, just a few issues which make it frustrating.