You have made another great game. The artwork is excellent as always, and the zombies are funny looking. I mean that in a good way. I made it past five-hundred days on my second try, but there were some really close calls. Some people might complain about the randomness involved with ever finding anything useful. If anything, this makes it more realistic because it would be very unlikely for a person to just find what they need. There is no certainty in the game, and there wouldn't be any in real life either.
There was an oddly large number of bookshelves everywhere, and breaking through a window would probably kill you instantly. The most interesting zombie attack was getting slapped across the face.
Some people might complain that this game gets or that it is boring. The lack of explosive action actually makes the game a bit more sophisticated. Since the game can go on for a very long time some sort of saving system would be nice. Also, some sort of reason for the zombies would make the game more interesting. If anything it would add to the hopelessness of trying to survive. Seeing that the problem extends far beyond yourself would help to intensify the atmosphere of the game.