Really, really cool. Got me many times and it is so spooky. I had a very similar idea to yours during the jam, and it's really nice seeing it so well made with deep interpretation of jump scare.
Although, at around day 4 I think, I opened the door as the quest was 'say hello' and the game freeze, think that might be a bug.
Overall, very well done, your game is my current favourate :)