• Overall: The game was really interesting.  I don't think I've ever played a game in this reading genre. 
• Fun: It was a lot of fun to read the world building and lore.
• Visuals (Graphics):  The novel images were cool, I'm not sure what engine you use to make this, but perhaps if you can add more visual feedback (like turning pages, or text scales/makes sounds when you hover the mouse over it, etc.) it would make it more appealing to a broader audience because it is very static. Also a subtle paper texture as the background might look nice.
• User Interface: This simple style does fit~ 
• Audio: Some optional ambient sound, like wind or chill music might help set the mood. and as mentioned above interactive sounds would help to immerse the player. (Almost just feels like I'm reading a webpage)

Great work and keep it up! Please check out my game when you can :D