It works!
In the room with the knife-throwing guy and the lightswitch, you can make your character walk on the walls. I don't know if this happens anywhere else, and although it doesn't hurt the gameplay, it sure looks weird.
I didn't like how the characters only looked at the screen, even when moving left or right. If this is too difficult to fix, I'd suggest taking the guy's hands out of his pockets. It seemed like he should be afraid, but he looked kind of bored. Overall the graphics seemed lacking, but you already pointed out why that was so
However, your game was amusing and wasn't overly challenging. It would benifit from added length. The song was kind of catchy and definately suited the game, but there weren't many sound effects. Perhaps some moans from the zombies?