Hmm that was a fun, if somewhat incomplete-feeling experience. I felt like the idea of an fps farming sim is pretty neat, but the mechanics weren't quite there to support it. I tried out it audio version, so I'll offer some feedback on that too.
* The gun having no ammo limit/no downtime between shots meant there was no reason to ever stop holding down M1, which made the combat rather unexciting because you didn't really have to manage anything. The same is true of the sprint, since you can sprint endlessly there's simply no reason to ever slow down (you still stop instantly, so momentum isn't as issue).
* As far as I could tell, headshots aren't any different from bodyshots, which combined with the above meant the first order optimal strategy was to simply hold Mouse + Shift down and keep spinning the mouse around randomly (especially since it seems I was faster than any of the enemies and they didn't try to cut me off or anything).
* The portal was super cool, I might've tried to use it within the core game as an ability or something simply for the coolness factor. It being limited to level swapping meant I didn't really get much time to appreciate it.
* The gun feedback was somewhat underwhelming, both on the visuals/gameplay end (no recoil to speak of) and audio (it sounded fairly weak and dinky). Maybe you'd planned upgrades with more powerful feeling stuff with recoil + sounds? A shotgun might've worked better given that you're a farmer getting goblins off someone's lawn.
All that said, as a gamejam game it does alright, but if you'd want to continue working on for a postjam release I'd highly recommend revisiting some of the core systems and adding some game feel and depth to them.