very nice! i love zombie games and this is very very good. it gets a little boring after the first two levels, In a zombie apocalypse i would rather run than shoot. anyway...CHAINSAW CANNON!!!
the game reminds me of a sega game called "The Ooze" which instead of using something similar to metacircles it generated the character using cellular automata. might have run smoother with that.
great programming and design, but chosing such a simple character in order to use a perspective 3d-like view may seem a way to compensate some artistic flaws. hire an artist the next time.
as long as i don't find any bug in this game, i rate it 5/5 : for the extensive use of state of art techniques, procedural generation of content, style, music.