The music gets annoying really fast (good call on separate music/effects mutes); more songs or a song choice option would be nice. A horn button would be a nice touch for those deranged folks (like myself) who like to drive while beeping relentlessly for no good reason.
*sits at start trying to use WASD, drives straight into the middle, does doughnuts for 10 minutes, drives off into desert and gets lost, comes back and drags a concrete barrier around half the track* "You did an awesome lap!"