Arrow keys to move, space to shoot, up to jump. Be conservative with your ammo. You start with only 10 shots. Every so often, you get more ammo. Kill all of the enemies in one level to move to the next. Every time an enemy dies, you gain one health. Sadly, I didn't have enough time to code in alternate moves, characters, enemies, money, loot, or platforming as I was hoping to. If you shoot backwards at the start, click the flag 2 times.
Credit to Risk of Rain for the character sprites and enemy sprites.
