Hello! Just played the demo, I must say I really like the concept and found the gameplay to be really enjoyable. The lack of dialogue and the fact that you find everything out through cards really makes you feel involved, since you have to constantly make conclusions about what's going on. Some ideas that came to mind that might be cool:
--> A map of Hillthorn, although idk if that would maybe break the immersion of going through everything in your mind (I really liked how we had to walk to the village using the cards, very cool!)
--> A separate notebook for personal notes (e.g., writing down our own ideas, what cards we've already used... Though I'm not sure how useful it would be)
--> A pop-up window after you click or move over a card that tells you how much time an action takes.
--> Do you plan on adding any music? I like the background noises when you're at the village, so maybe some light background music would be nice.
That's all I got so far. Good luck with the development, I will be following your progress :)