Thanks for playing! Your commentary was funny too, haha. The hitboxes for the zombies are a bit funky and for that zombie specifically you can get stuck on its head because the roof is too low. We'll try and fix that. Also, now that you suggested it, I think we'll let the rifle be full-auto!
If you're interested we plan to update the game sometime after the game jam we made it for is over. I can let you know when that is released, if you like.