If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Mouse - shoot.
1, 2, 3, 4, 5 - switch weapons.
A tiny rent-a-cop with a very big arsenal defends a cemetery against rampaging ghouls. Why you may ask?! Because it makes complete sense in the gaming world other wise don't ask silly questions! Enjoy!