Seriously impressive execution and scope!! Art style looked great at first, hurt eyes after a while (played fullscreen, so very pixely). Key objects didn't really pop out to me with lots of visual detail in background. I only found one key. I definitely felt the survivor-horror feeling of claustrophobia and being underpowered and vulnerable!
The realtime shadows on zombies was especially cool with the dithering effects. Performance was kinda bad in browser though and audio was very garbled throughout.
My most specific design critique/complaint was being annoyed a few times from camera breaking the 180-rule...exiting from right -> entering from left in the next screen and then accidentally backtracking because I'm holding Right arrow... like at 4:35 in my gameplay vid-->