Finish it with ai. Badly trained ai can create some orerty diaturbing looking images.
If she left because porn is more profitable, why not make a porn version and sell early builds on onlyfans or patreon or whatever. Anything to keep it going. Could be episodic venture and then one day put all episodes in a long final release 🤔
Hentai games can make alot of money. Whatever it is it needs to retain the charm and creepiness and weird sense of humor