I see the vision here... but I think it fails in execution. As far as I am able to tell, there is no way to check a book other than just clicking on it. It would seem the game is structured around just clicking every book, and hoping you find the 5 you need in time. Perhaps if there were instead a singular bookshelf with books, and the player was forced to select five that have the needed pages, but selecting wrong ones would send the player back in time? Then the focus would be less on mindless clicking and more on problem solving and logical deduction with clues that could be in the library. Maybe some way to communicate with yourself in the past, like a temporal notebook? Again, I see what this could be, I'm more disappointed in what it is not than what it is.