The Game is a pretty good base. I feel it could use a bit of animation on the enemies when hit, having varied enemies would be a good next step too. if you could have some random drop weapon swaps during a round that would be Ace. Also since it uses voxel art, if you implement destructibility to the trees that would also add to the immersion.
Nice work for putting together in a week, I can see a lot of potential if you continue to work on it post-jam