I am zombie Michael Jackson!
First I thought this was a game about killing zombies. I started in joke mode, expecting it would be the most easy way to get around the game and killing zombies. Just think of my surprise, when I realized that I couldn't (neither could they kill me). I just could walk around corridors followed by my zombie fans which would gather around me after some time and cheer up to me. It seems as if I could shoot different types of fireworks at them and waving with my hand. But there was no exit, nor dead. I was trapped in a cheering Zombie crowd.
Well---maybe this was not the intention of the author and it was a bug?