Took me a while to understand what was going on. This is a cool little game (and one that is made from scratch in 3 days, especially). I just wish there was a goal to finish the game (or maybe I just didn't saw it). I also like the L4D references with the boomer and spitter enemies.
I'm on linux, so I ran it using WINE. I'm not sure if it ran perfectly, and I'm curious if there's supposed to be music and sounds in the game.