The dev is quite active in this thread, simplest way is to ask him directly.
It would be the simple and quick way for sure. But I return to the case of Milfy City. The game was abandoned for Years.
However, as we all discovered pieces of the puzzle and gradually found almost all the assets of the game on our own, and along with that, we were publishing our own fanart, two phenomena occurred.
First, the satisfaction of "discovering the hidden", and then the feeling of belonging to a community.
Over time, and seeing that there were still people interested in it, the game was started again and a concrete ending was given.
A good dev will know how to take advantage of those things to create a community around his game. Maybe he'll drop some pearls of wisdom on his own, without having to hand everything over to us.