Thanks so much for playing!
For the paper flipping:
We "turn a page" by treating each sheet as two flat UI images (front + back) parented under a clipping plane. As you drag, a bit of trigonometry keeps the page’s corner locked to a circular arc between the spine and the outer edge. That moving corner dictates the clipping plane’s pivot/rotation, instantly hiding one image, revealing the other, and shifting drop shadows so the sheet appears to bend. When the mouse is released a short tween snaps the corner to the next stop, updates the page order, and the book is ready for the next flip. All with simple transforms, no real mesh deformation, it's done in Canvas in Unity. We studied a few Unity assets to get it working the way we wanted :)