It could show the number of lives, if you eat a bad burger, it could lower your score, it could speed up each level, for each level it could be acceptable to eat a certain amount of good and bad burgers. It was good before, with burgers appearing all the time.
I am going to keep it where the good burgers are spawned at the same rate and amount to get to goal. And for the bad burgers (will randomly spawn at random times faster than good burgers at 3 of the 5 spawn points for challenge. (Will add health meter so that if you eat more than the amount for each of the following rounds. (10, 5, 2)) it will be game over.