Amazing - and good luck (I loathe solving CORS issues personally)
Maybe, but you’re also adding functionality for video games & web books - which are also pretty popular wants 
(I am looking forward to both of those when the time comes tho!)
Sorry to add, but…
Spoiler tags for reviews are still broken… the initial <Spoiler> tag is disappearing for some reason. This affects both previews and the actual reviews… it only seems to be on the book page, and not the individual review link. So:
https://learnnatively.com/book/1b9a2e8116/ (犬夜叉 24)- spoilers are not blurred
暁のルナ's review of 犬夜叉 24 | Natively - spoilers are blurred
Also, while not the biggest deal, when you load a book page, some of the state is not displayed properly for a bit (in an FOUC sorta way). I don’t think it was doing that before.
What it looks like initially (for about 1-2 seconds):
What it should look like (difference is in status & rating, on left):
