I really like your writing style. And god bless you for making this mobile friendly. I have two suggestions.
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This is purely aesthetical, but I didn’t like the font. Helmet looks too aseptic and industrial, and it’s even worse justified. Not the best experience for reading, specially fantasy. You can’t go wrong with the classics, Times New Roman, Helvetica, or Georgia.
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Move the notifications to the bottom and make it last longer. The notifications show when you turn the page and the reader’s eyes is at the bottom of the page in that moment. When I noticed the notification it was too late, it was gone. I literally missed all of them.