I like it. I didn't get far into the ledger solving as I couldn't find any more hints.
The UI needs all the polish it can get as it's critical for the game. Wheel scrolling, memorizing screens when closing the notebook and minimizing the amount of clicks overall.
The slow unskippable dialogue got me thinking, what if some of the dialogue was a companion NPC you could talk with in some way in the background while you are walking around investigating, which would subtlety give player optional hints or just flavor text? Didn't play it but Firewatch could be something close. Think of it as MC's Watson.