First off, Loving the game! Been a big fan of watching others play it and have been having lots of fun playing myself, even the scares I've seen others experience catch me off guard. Haven't progressed too far yet myself but would like to give a dumb suggestion , others in the thread feel free to give feedback or info on why it may or may not be a good idea.
1. An entity similar to a "Pale Crawler", this suggestion is purely based on my love for that sort of cryptid lol, but anyway I think it would be a good addition with how it would be a good "its mistakeable for an animal at first glance but when you realize what it is its gone" sort of deal. I also think it would work really well with the camera feature (one of my favorite features, too little games let you have multiple perspectives from one base) as, while its a creepypasta and fake image, The Rake image is still somewhat unsettling to me and it would be wild seeing something like it in real time. For how it would look anything humanoid but with little to no features would work, there is this one image of a pinkish-pale "alien" on top of a roof that I would work well with not being too recognizable but still humanoid. How it would fit lore wise? I don't know. How it would appear? maybe as an unfrequent event? But that's just some ideas, don't know how well it would fit into the game.