The game's probably not completely dead. The developer wrote somewhere officially that he's trying to stick to releasing one Endowed update after every 2 Hypnosis updates. Hypnosis is his primary game, it's older and likelly more popular. And the problem arose from the fact that for the last update (Hypnosis chapter 14) he probably went a bit overboard on the size of it, he worked on it for probably longer than a year. And currently he's working on the 15th chapter, which he said is about 70% done.
So it's possible he'll go back to Endowed when it's finished. I don't know if he'll do that, but it's possible.
Otherwise, as someone mentioned that he released a new game, that's not quite true. On Itch.io he released a premium edition of Hypnosis (containing chapter 14, while the public version currently ends with chapter 13) and along with it "My Ex-Girlfriend's Hot Friends", which is not a game but something like a light novel/book. And from what I understand, it's something that he gave to his backers on Patreon more than year ago.