I think I have a solution. I'm modifying the layout of the library a bit but I realized I can make some of the tiles look like doors and then color them. Bright doors are books, dim colors go to other maps, black doors are other rooms.
As for bug testing, I'd love that! The feedback would be helpful. There's a bit of a mess at the moment as I've been adjusting things. What's the best way to contact you? If email works, you can reach out to matt@clevercat.games.