I really like the design, and the idea is nice. One suggestion I have is making some way to add books from your My Shelf page. I didn't see a way easily, and

I really like the design, and the idea is nice. One suggestion I have is making some way to add books from your My Shelf page. I didn't see a way easily, and ended up just going to the browse page. I'm assuming that's probably the flow you want, but you may want to have a plus button or something on the shelf UI that links to the browse page for books.