What worked:
Pushing ghosts around if they were in my way was pretty funny. I'm not sure how good of a mechanic it is (possibly want to make them intangible to the player), but the idea of a housekeeper shoving ghosts around for being in her way is hilarious. I liked that some areas were better left closed. It gives a variety to opening doors, and an idea that you should focus on the objective and not wander around making things harder for yourself. You could also add something for the player if they want to wander into ghost riddled rooms in an expanded version.
What didn't:
The insta-kill obstacles were a bit too hard to see. Some sort of texturing on them might help with this (light dithering, even if just on the edges). I kept running into them because my eyes just registered them as part of the darkness.
Bugs:
Restarting after winning starts the player with no light.
Great job! RIP to the moon.