I figured out the true trick to getting a highscore after struggling with the steering a bit... Just riding a big circle around the map over and over and let the cars defeat themselves. :P
I wish maybe the borders of the map didn't kill you but maybe looped you around... The steering is just a bit too slow compared to how fast you go so it's difficult to move around comfortably with all the obstacles on all sides of you. :(
Was pretty cool though, like how it looked!