hello, I got a few suggestions which are largely my personal opinion:
the app reader could have volume keys controlled page turning, like some others, it is really nice to be able to read hands off the screen. I like the way jnovel web groups together series and allows you to buy more. now I am pretty sure that doing that exactly that way would be pointless because the app has a slightly different function which is reading, but the library is a bit messy at the moment to say the least and going back to the series "store page" is more work than I would like (I won't die, but ideally UX wise...). I think the library should be a bigger focus rather than chucked into the user tab, it should have its own section at the bottom for example, I use that the most to give quick peeks at stuff I have not worried about downloading on the given device, this may not be true of all but who knows.