So I’m guessing the protag becomes the demon after sleeping too long? I feel that you could add some more sequencing to everything that takes place outside of the bedroom/when the two entities interact that make the transformation more obvious. The rules in general don’t seem to be consistent, like when the creature can specifically hurt/possess the protag.
Oh, this does present an issue btw. Theres something you generally want to avoid called “the pronoun game”, where you begin a sentence with “their/they” without specifying a subject. So perhaps ending it with “i approached the child’s room” or something equivalent.