What was my problem? I didn't understand that I had to give the item to the person and that I had to click on the person specifically. It wasn't obvious.
In the full version, you'll definitely need a tutorial, and probably help the player through the gameplay loop over and over again.
Forcing the player to make mistakes is a bad idea.
The game should let the player know what they did right and what they did wrong. Your game doesn't do a good job of this. The green and red lights are kind of muted and appear for literally a couple of seconds. The sound doesn't help either. If the game automatically entered this result into the book, it would be intuitive. And of course, it would be nice to immediately show it to the player.
The game has a nice atmosphere. But I quickly got tired. Constantly rotating the camera, constantly opening and closing the book, constantly memorizing the fear-item pair and the fear-item-result trio, forcing myself to enter the result into the book at the right moment.
I'd recommend getting rid of the camera rotation. Place everything that's needed in the window in front of the player. Perhaps even keep the book open at all times (if the book is needed at all).
Well, I hope you give the player a clear goal in the full version of the game.
(And by the way, after closing the book, the player needs to click on the game to restore the camera rotation.)