Use the arrow keys to move. Chase the zombies that are smaller than you; zombies can't bite things that are bigger than them. Each time you kill a zombie, you get bigger and stronger. But stay away from the bigger zombies, they will kill YOU!
Mostly me, but I watched some of griffpatch's zombie cube tutorial to help code the zombies. By the way, you can win, but only if you get your size up to 1000 xD The graphics are terrible