Interesting idea, who wouldn't want to gun down hordes of goblins with a machine gun :-)
It could have some extra juice, the bullets felt a bit weak, maybe some red flashing when hitting and a little goblin knockback would solve that. Maybe making the game faster would create more tension as well. Also, the camera follow is a bit slow when going down, I often hit the edge of the screen and couldn't see very far down.
Otherwise I loved the attention to details, the paper map, the game books on the edges, the floor outside of the table, the fallen figurines, ... so many little things that makes the game feel like it's happening on my table. Good job!