After checking it out for a bit, it's a decent game, good for a game jam,
The game feels a bit "dry" in the sense there's not enough feedback, it's confusing what to do as well, and picking up heavy weapons completely stops you from moving, then that begs the question, how do we use those heavy weapons? Why can't I move while holding it? Then you remove one, keep another, you can move, but you can't swing (Maybe a bug?), I was not sure what to do as I didn't read the description first, and generally not a lot of players would read the description first when the game just starts on their screen (Like it did for me), so I think a better idea would be introducing them to the game through a story, possibly showing the end boss in a kind of animation to display what's required to be done, to just simply introduce the player to the game, then possibly a zoom in to get them into the world rather than just appearing there, would give the player slightly more knowledge of their surroundings prior to starting.
Another thing would be actually pausing the game while in the inventory, I couldn't move while in the inventory, but could be attacked, and I think that's just unfair (I died several times because of this, trying to equip better weapons).
From my perspective, a lot of bugs in the game, and I didn't even get too far (Take this as played for a bit until I got very confused as to what to do since I didn't read the description first), although it's a good concept and can definitely be improved. Great job!