Nice entry, but just a couple bits of criticism:
1) The gameplay got old fast. I wish there were a couple more mechanics involved, like what if instead of just one input there were some monsters that flew above the fence and you had to shoot them with a bow and arrow, and every day you got paid and (sort of like Papers Please) had to manage your money. Stuff like that would've gone a long way here.
2) There were a couple times when killing a civilian or letting a monster through was unavoidable. To fix this, maybe you could have a check when you spawn monsters that checks if they will arrive at the fence at the same time as a civilian, and then spawn them with a delay instead.
Other than that, great entry! I liked the look of the game, I thought the buff elf and the voice acting were pretty funny, and the game felt pretty polished. And, while the gameplay was a little basic, I still found myself enjoying what it did have to offer. Overall it was a fun experience.