About the incest ban-again nobody is forcing him to make incest games.Not to mention that is the most stupid reason you can think to end Milf's Villa like that.
Technically, Milfy City is not an incest game, an external patch is used to make it look like incest. Something each player has to do THEMSELVES. Milf's Villa was and still is an Incest game by default, hence he had a pretty good reason to start a newer better game.
Here are your choices:
1. Continue Milf's Villa, but first, port it to Ren'py and rewrite the whole story as a non-incest one. To fill in the gaps between the scenes, make additional renders and write dialogues for them as well. Create a new mini-game to replace the old ones as they would be difficult to port into Ren'py from RPGM. Finally, after doing all this, add new content and progress the storyline.
Mind you the story wasn't just at the starting stages.
2. Make a newer, better game from scratch. New characters, new designs on a better platform (a la Ren'py). Better graphics, better gameplay. Just everything better, and have enough time to find a way around patreon if needed.
If you want to understand that, you need to think with your brain.
I can understand if after that he is making completely different game,like JOHN or BAD or COBD,but no he is making the same incest game with same age MC as always.
You are here playing the game, falling in love with his characters and having fantasies about them.
He's just meeting the demand with this buddy. Nothing else. Darkcookie, lewdlab, MrDots- some of the top patreon earners, all made their name and money with incest.