Hello !
I must say, the navigation menu with the small white circles is a relly great implementation.
Its a very innovative feature !
But if I have Book with many pages (sometimes over 100) and only 5 circles are in a row,
its not possible to see all the circles.

I see two possibilites to solve this problem:
1) Implementation of a scrollbar.
2) Instead of drawing the circles below the navigation, you could
draw them above.
Many greetings
Marko Flod