I was seriously disappointed when I first fired the bow, and the arrow stopped after hitting one enemy. It should be piercing! I ended up using AK-47 for most of the game as well.
The game gets pretty snowbally once you max out Damage though. I only died to the boss who hooks you (maybe his hook should break if you run far enough from him).
If you're taking suggestions, I think it could be nice if zombos left behind a pool of blood. And maybe a graphics mode where everything (excluding blood pools) is black and white.
The music was very nice by the way.