We ended up with quite similar ideas for this jam! I quite liked your camera effects though.
Visuals and mechanics I quite liked. I think a delay between photos would be good, I destroyed the poor demon in a rapid-fire series of photos before it knew what hit it.
I liked coming back and seeing all the ghosts messing about with things like the lamp after getting the camera. Definitely a cool idea.
My biggest criticism is just the lack of ambient audio. Silence can be effective, but as a comparison or juxtaposition. If you walk into an area and it suddenly goes quiet, the player is set on edge. If it is quiet all the time, the player just gets used to it very quickly.