Space to fire, don't let the zombies overrun your base. When you run out of health, the screen turns blue and you respawn by hitting the green flag. Sometimes it doesn't fire when you hit space, and it sometimes doesn't do damage to the zombie. If you have recommendations on how to fix this you can write them in the comments, or you can remix it. Also, feel free to make the graphics better if you want. Also do please post this in your studios. :)
One of my friends reminded me to do this.