Pretty cool, the arrow bouncing is nice and the zombie with the torch and wall zombies bring cool ideas. Also the sound and screen movements when you hit zombies are really satisfying when you hit a few of em at once. At first I thought the fire was an obstacle I couldn't walk on, and then I realized it was speeding the arrow up, which is a pretty cool mechanic. I see how you could get some big combos with that.
I think it might be a bit too easy, or at least doesn't continue to increase in difficulty at some point? I was able to go 6 minutes on my run before I let a wall zombie blow up and I felt like the difficulty wasn't increasing anymore.