This game, or rather its further development, is apparently dead/discontinued.
The two developers keep talking about upcoming sequels, but if I have to wait 10 years for the next update, I don't need that. Apparently, they can make a pretty good living from Patreon contributions...
According to my records, the last time I updated was on August 17, 2022, to version 0.4P4. This version hasn't changed since then, neither here nor on the Patreon page...
It's actually a shame, because the idea behind it and the story are pretty good. But these days, I've completely stopped buying these kinds of games here or even constantly making contributions to Patreon, ultimately for nothing and, over the months and years, a small fortune for nothing in return...