My 10k html5 canvas game - last man standing

This is my first game inspired by the <a href="http://10k.aneventapart.com/" rel="nofollow">http://10k.aneventapart.com/</a> contest.<p>I submitted an earlier version to them an hour or so before contest close, but this version is a little tighter.

Very inspiring, I loved the logic that makes the zombies follow you.