For red: a and d to turn the canon and w and s to fire. For blue: left and right to turn the canon and up and down to fire. Destroy the dirt to get points when you have no more lives the game stops. IF you killed the other person and you have more points you win. Otherwise its a draw.
Music:? Sound Effects? The link is lost, but I know it's from @griffpatch. The project name is "Lemenoids". Code and Art 100% by me.