Double click green flag. WASD or Arrow keys to move. Click or Space to shoot. The map at the top right shows where every zombie and boss is. The bar at the bottom right is your health. After you kill all the zombies, the boss will come and throw rocks at you.
This is a much better version of one of my older projects. https://scratch.mit.edu/projects/724881998/ The biggest bug with this that I don't know how to fix is that zombies can walk through walls when they're not near you. And also the boss can walk through walls.
