Yes desktops aren't very suitable for book reading -- can't lie down and read, mouse feels clunky and a portrait book is pushed into a landscape screen. Yet a lot of people do read on their desktops. I have noted all the inputs from you to optimize it better for the desktop.
Bubblin currently is iPad first.
We are not only responsive but also maintain the presentation/story telling aspect of the book page-by-page no matter which device you're on (Supported on 42 Android/mobile devices). Sorry about the stuck-mouse-click bug though :(
I will fix it soon.