Shoot the zombies and don't let them touch you! Every 10 kills gets you an upgrade to fire rate, walk speed, or you can heal 10 health.
Please enjoy, I worked very hard on this. I am also currently working on it, so expect new things often! The credit for the health on the zombies goes to @Bighappyscratchuser! I would have never figured it out if it weren't for him! Go check him out and give him the credit he deserves!
