Fun game! I like that it actually responded to my answers at the end :)
I like the idea a lot, but the zombie can't kill you and you fall through the map at a certain point.
It was fun to find out how it works, a bug I found ;there's a block just before the brain on the right that let the zombies float in mid-air. Nice graphics and I like the munching sound.
The idea was amazing, it was fun to play and it's nice that you can sort of choose your difficulty.