King's Tale is a VN while Man's Best Friend was a game. Not sure why he would include a beta of a new game in King's Tale instead of continuing with Man's Best Friend, but I'm not planning getting sucked into that game just for him to drop it like he did with Man's Best Friend.
So you are doubting the developer? Well, I must say King's Tales most recent update was very promising, if you haven't checked it out yet, you should.
AdultKing himself has been rather busy perfecting his games. Although he was gone for awhile, that doesn't mean you should put doubt on him. He still makes good updates for his games, however Man's best friend he probably will not continue, since he has already stated that he is handing the source code to someone else to finish the game. Henceforth, you need to understand and scrutinize one important factor. Developers take time making their games, and the reason as to why they take so long to release updates is because they have to run beta tests of the game beforehand. The purpose of beta testing is testing the game for bugs. Furthermore, games require a team of writers and coders to help develop the game. Finding writers and coders is a tedious process, but devs do what they do best to make amends.