Great game! I love driving games where you aren't given a specific objective. Lot of fun!
By the way. I'm new to Unity, and am currently creating a driving game, where you can do what ever you want (similar to GTA). I've been trying for weeks to figure out how to create a realistically destructible model like you have in your game. Any information on how you pulled off the "bending" effect when you crash would be greatly appreciated!