Is this game abandoned? Last update was May of 2019 from what I can see
Viewing post in Dual Family (NSFW ADULT) comments
I believe it is abandoned. Not only that, the developer is tricking people into giving them money for a product they are clearly no longer working on.
The fact that they even hide their 'update' news behind a patreon paywall is further proof of this. You literally have to pay to see any news regarding this game.