initially I worried that the puzzle landscape would not fully be explored, but as I got into some of the high levels, I saw that there's use of having books that could fit on different shelves, and you have to deduce which it needs to go on (rather than simply matching). The game-play matched the theme well, and as much as I have ideas how you could add some more mechanics to the game to spice things up a bit - that may detract from the vibe / genre of game you were going for.
The ideas you had for increasing score based on order within a book shelve would be an interesting thing to see. I'd like to see if you can make the act or switching between shelves feel more fun. Maybe I should have been going to the library view and back again, but I was justt using the arrows to switch between them which didnt feel great and didnt help me keep a concept of all the shelves and their configuration in my minds eyes.
Thanks for taking part in the jam, and for checking out so many other people's games!