That was quite fun. The leaderboard definitely motivates one to keep replaying. The visuals are neat; I especially like how the farmer turns into a zombie when dying. I wish there could have been more upgrades.
Initially, I was going to comment on how zoomed in things were, but to be fair, that's a normal thing to do for horror games. I still find it a bit awkward to work with, so a suggestion might be to stay zoomed in, but nudge the camera towards wherever the gun is aiming.
The constrained nature of the level was annoying at first, but I found it quite useful to funnel the zombies with. If I wasn't careful, I'd end up backed into a corner, so it became an interesting tactical mechanic, where I needed to herd the zombies best so I could reach them with my gun, but also not get trapped by the horde.
I feel there wasn't enough when it came to damage FX, in particular, the player. I didn't even realize I was taking any damage the first run I did. Some louder VFX, some particles, and even some UI stuff (like a red vignette when you're low on health) would go a long way in this regard, I feel.
Genuinely, fun minigame. Cool submission.