Loved playing this, concept was cool and I think would be much better with 4 players. With fewer players it does become easier by leaving out some of the controls. I can imagine a 'hard mode' where different players control steering/acceleration/gear-stick/clutch.
Art style reminded my of 'Simpsons Hit and Run', and everything was really smooth! Well done
[we've also got a local multiplayer game and struggling to get ratings - don't worry if you don't have time to play it though ^_^ ]