Press Z to swipe with a claw Press C to shoot a fireball toward the current mouse position. Press spacebar to reset the game. 2 Heroes spawn a second and automatically move toward the nearest 'subroom' location. They'll damage the boss if they stay in their subroom for too long.
Nerf the boss' fireball attack to have a cooldown after using, start with 3 ammo, and restore up to 9 ammo over time, about 3 claw swings per ammo restored.