Was an interesting and fun game! The research you've done on serial killers shows as there are patterns they follow that have been recorded and using that to make it into a supernatural game was really cool
The scares and everything were done, and the only suggestions I can give you is to take wherever was in the Case Files and put that at the beginning of the game. Maybe make the player play through the life of the Detective first and then build up to the murderer and the house, and maybe talk about the killer a little before showing the house itself. Building things up and giving hints and making things connect at the beginning and end of the game makes the story very compelling and feels satisfactory to the player.
Though you did have the Case Files, so kudos to that as it shows that you did think about the story and everything.
But yeah, great little game! Good luck on any future projects you might have!