Interesting idea (Very "Emily Wants to Play"-esque), but the mechanics mostly just straight-up didn't work when I played it. "Mortem", or at least the demonic black doll, only ever pursued once, and was stopped by collision. Afterward, I was able to cheese the game by continually flashing her. Also, the "hiding in the closet" mechanic didn't work at all.
Would love to see this game get worked on more, and possibly re-visit it another time.