You can just drive across the grass and win. Maybe add some boarders so the driver cannot go off the track? And I really would recommend making it a Player vs Comp game as the 2 player on one keyboard only for a submission really does not work. People are going to see this alone and try it before asking a pal to come race with them. Being there is no challenge of actual competition people will just find it boring.
Hope you keep trying though. And good luck.