Press the flag twice. P1: Arrow keys to move, p, o, i, j, m, k, l keys to fire. P2: A,W,S,D keys to move, Space bar to shoot. The monsters can only spawn outside, but they can walk inside. Whoever has more kills when both people are dead wins. The top left side of the "outside" is p1's kills and life, and the right side is p2's. The bottom left and right are the reload times of each player. (in seconds) It lessens the more kills you have.
I got inspiration for the boss from Legend of Zelda
