I loved this one! I didn't expect them to walk around walls and in and out rooms, so I couldn't hide at all. The camera moving depending on where you point at felt pretty good, so I could shoot ghosts that were farther or just have a look around. And the lighting was a nice visual touch.
Two things I would change would be to make the guns contrast a little more with the floor, and maybe have less ghosts at the beginning of the fourth floor, because most of the times I got surrounded right away and there wasn't much I could do. The ghosts got stuck into each other sometimes, but I am still surprised how good the pathfinding was for a game jam entry.
On a silly note, the pistol shot sounded a bit underwhelming, haha, but maybe that's just me.