Well, like an idiot, you decided to go target practicing in the cemetery. Now the undead are ticked off, and they're after your brains! You'll need to shoot their heads off to stay alive. Think you can manage it? If you let them thrust their heads at you, they'll bite! However, if you can hit their heads dead center, you'll get some health back. Be sure to reload often by pointing your cursor at the bottom of the game screen.
Controls: Mouse to aim, fire, and reload.