Is this game abandoned?
Unless the dev has a miraculous change of heart (unlikely), it is abandoned in game/VN form.
Apparently, it will eventually be released as a series of books. But the current hanging plotline… I wouldn’t expect resolution and time this decade.
Personally, as someone who has seen stories go on hiatus since the 90s and 00s, I don’t see it ever resolving. Every once in a a while it does happen but it’s rare enough to not be worth keeping your hopes up.
The number of games I've played and had to drop due to creators abandoning their projects was what inspired me to start writing my own story. 3 years into world development now, I'm getting close to the point of being able to actually start physical work. It's definitely fun and shouldn't take as long as I've let it, but I tend to slack sometimes, and I have a pretty busy personal life, so it is what it is.