This is the destined fate for many great hentai games. I still visit the little metaphorical graveyard in my mind to pay respects to the greats.. Like Hero and monster, Erotical Night 2, and Labyrinth of estra.
There's all kinds of reasons why a hentai game stops getting developed, and sometimes it doesn't just stop abruptly. Sometimes it's a slow death. Sometimes, it's a very subtle, quiet death. But when you know, you know, and it's better to just lower your hat and pay your respects, than quietly hope it'll just magically revive itself at some point.
If it does, it's a pleasant surprise, but you're only wasting your time simply hoping that it will.
Let sleeping devs lie. If someone's dumb enough or has a disposable enough income to feed them money when the black smoke is billowing and the red flags are at full mast, that's their own problem.