Congrats on finishing your game!
It's an extremely hard experience. Couldn't get very far, but I must say it was satisfying when I could move my car for even just a few seconds on the road! Perhaps making it a little less difficult right from the start would be a nice way to encourage the player and get him/her engaged! (like a straight road with maybe a tiny bend).
I also think it would be a good idea to have the music smoothly run in the background, without resetting itself whenever you lose (this would make losing a little less jarring).
I like the main menu and how you can control the car directly in there (kind of acts like a safe tutorial to try out the machine!).