The concept is really good! Looking for soundwaves to find the bookworms is a useful hint, and I liked the general atmosphere! Procedural levels are a win for me, too.
Something that I think would improve the game is control. It felt weird to me that W/S moved the librarian vertically too, while the spacebar didn't seem to work at all
Also the camera moved so much at the slightest move; a slidebar to calibrate the camera rotation would've been neat