I was using a 360 controller. If you're going to continue working on it, feel free to let me know when you update it, and I'll test it with my controller again.
Well, something quick that could be added is your score after dying, so there's incentive to replay. Your time alive and/or zombies killed. Ideally also keeping track of your top score.
I also found it to be a bit too easy, I only took damage once I intentionally stopped to do so. The zombies attack animation hitting home faster would be a good change. As it stands, I was in a position of "how long do I want to play this?" rather than "how long can I survive?" I was completely surrounded a few times, and just walked through the horde without taking a hit.