I would suggest making some alternative scares, and creepier moments, like maybe having someone look at the house from the outside at some point, or a car driving by slowly. Y'know, lore stuff!
Great demo. Can't wait to play the full version.
Game jams are usually 2-7 days my man. 20 Days is plenty of time to get something out.
This was made in 30 for a reference.
https://racheldrawsthis.itch.io/cold-front