As it is currently, 2 chapter or books are complete and a 3rd has a lot of content for it already.
Speaking of content, this game has a lot of it! As many have said, the 2D art is great and you get to see plenty. "Animations" are compiled from a few still frames so they're not truly animated per se, but it's done well regardless. Besides, there's a lot of hot scenes either way so I'm not complaining.
The first 2 books at least have a couple different routes you can take, and the 3rd will likely have the same. The routes are sufficiently different to make their exploration worthwhile, and in the case of the 2nd book, drastically different.
This is a RenPy game. It runs smooth (likely thanks to the author's good coding practice, though as a layman I wouldn't know), the story fits with the universe well, and the universe itself as well as the characters within are quite faithful to the show/series.
Also it's funny as hell. The author has a great sense of humor, but there's some serious moments as well. It's a nice balance.
I'd like to state again just how much content this game already has (with more on the way), all of it quality. There is, however, plenty of grinding though I wouldn't say it's excessive. Much of it can be bypassed with console commands, though I'd save before attempting.
All in all, definitely one of the best games on this site. One could easily spend 10-15 hours or more on current content and I say it's worth it.
EDIT: March 2023, the game is pretty much complete at this point, and several years later it's still getting updates in the form of sexy scenes and the like. This game is still the fucking GOAT, highly recommended. Mity's an OG and a baller.