Hey, I think this is amazing. I personally really like stories. And not only read but create by myself. The product looks fabulous. Simple navigation and a nice soft color palette make it easy to use. What I could not find is how to mark the specific word or text line with a bookmark. I hope it is there, and I just did not find it. Night mode is also a cool feature. But for me, it looks like it has more contrast level than in the day mode. Maybe a little different line space could help. Also, I think it would be good to have a save to favorite inside the story, and not only on the Home page. Just because before you start reading it, it is difficult to understand if you like it.
But overall, I think you created a great product. Wish it becomes better and better!