I am not a big fan of jumpscares but this game has some good ones and also the other kind of horror that is really unsettling to experience, I really enjoyed reading the stories on the books, I don't think anyone would like to skip that, except maybe on a second play trough.
I am surprised that, with this being your first game, you already nailed so much of what makes a good RPGMAKER horror experience, including how to pace the story, a nice cliffhanger for a demo and a good antagonist, Naiko is really enigmatic and Timmy (In hand form) is somehow charming.
I would love to see more of those unsettling memories, some enemies and maybe some puzzles on the full game, it would be interesting.
I noticed a few typos here and there but it is understandable with this being your first game and a demo, I know other things take priority during the learning experience and that's totally OK, it was nothing immersion breaking.
Anyway. I'll be waiting for the full release, keep the good work!