Needs a lot of work to even be average..
I can think of one decent thing about this, and that I somehow managed to kill 10 minutes with it, so I guess it sort of has a mindless appeal to it.
The game is pretty buggy. The swap weapon key tends to not work, and when a pile of zombie corpses starts to get large, it starts turning into a seizure inducing mess.
The gameplay is pretty repetitive. The weapons are a little pointless, as that bat you have can easily take down any number of non-boss zombies, making the game extremely easy, and the bosses a ludicrous spike in difficulty, but even then, they're laughable if you happen to have any weapons aside from the bat on hand.
The animation is a bit choppy, the the droning music gets tiring, and as far as I can see, there isn't even an option to turn it off.
Overall, I think the bland, bored expression on the main character's face sums the whole thing up pretty well.