I'd like to think I play a lot of NSFW games, but I follow very few of them. In Heat here was pretty much the first game here that I seriously started following, because I loved it. Now I have seen some games stuck in development hell, but more often then not I'm not that interested in them or I'm jumping in when they're practically abandoned.
But the keywords here I want to emphasize in my original post is "like this one." Yes, I am aware of many NSFW games getting stuck in some sort of development hell, but never have I seen a game just give up and move engines twice.
This game has been effectively going backwards for a number of months now, and they're going to ask folks to throw more money at them for the Unity version of the game.