Very nice, short zombie game. After you realise that you must pick up a weapon to attack, the game is actually pretty easy. Rather slow paced, so it's a bit like the classic zombie films. I liked the atmosphere brought by the ambient music and the lack of many other effects, which kind of fits the game. The twist ending was not expected (well, maybe after you see the cops), but I wonder if you get a different ending by not killing any zombie (which would also increase the difficulty)?
I'd like to invite your game to take part in our game making contest, the Game Development World Championship!