Compete for the highest score. Beat the boss or play until Game Over and the game will submit your hi-score at the end of the run.
Your next play
Finish a run with the highest score
A run means either beating the demo (i.e Beat the boss) or play until Game Over The game will submit your hi-score at the end of the run.
If you use a continue, your score will reset but hi-score will still be saved.