According to the Patron blog-- he is suffering from some burnout issues. Unlike other Patron's who just leave hanging while paying, he is suspending collecting payments or patron's until he refreshes himself. However, he still has a love for his characters, as we all do, and promises to come back.
How close to completion? Not anywhere close! The game is still introducing characters when it finishes the current content.
It sucks, because this was a good game. But it's probably dead. I guess the dev promised to come back when he no longer feels burned out, but there is no guarantee that will ever happen.