any idea why it got abandoned again? or are there any slim chance to continue this in the future?
He got flagged by Patreon for blackmail and rape content in his game regarding the Celia story (the teacher) which caused his Patreon page to be suspended. He was asked to change it and submit a revised copy of the game for them to review and unsuspend his Patreon page. He did it and said he would release the Judy content "soon" weeks and months went by and then finally a post saying the game will be on "hiatus" until he feels like working on it again because apparently Celia's story was "integral" to the overall plot somehow and he couldn't make it work with the revised version so he lost interest in it.
At least that's his excuse, I don't think he really wanted to work on it since he planned on finishing the game abruptly with flash endings for all the main characters but at the same time he'd lose supporters, so instead he drew new bait on the hook by announcing a new game: Milfy Mafia on Subscribestar (...completely scrapping Project X/Milfy Kingdom in almost a month of announcing it).
My guess is he wants to move his Patreon pledgers over to Subscribestar and eventually one day he'll announce he will finish Milfy City and stick to the original content of the game (pre-Celia changes). That's two revenue streams for the same game, it's his golden goose so he doesn't want to finish it off yet and wants to steal money off gullible pledgers.