Chapter 3—It's mostly a tech update. The models got way better, and the game runs much smoother overall. In addition, he added a day-night cycle and roaming feature to the game. It's content light, but the content there is smoother, has more animations and is pretty on point for building up the characters and atmosphere.
End of the line, what are you looking for? Seems like you kind of want a fast-progression game with heavy action from the get go. That's simply not how good NTR games are made. And it's not fair to say Episode 3 had pretty much nothing. Do I wish it had more, yeah, but it had better content in it than most games have.
The Dev seems to be going for a deep, realistic, experience more so than a quick fap game. That's why it has 4 stars. More artistic games that try something new or different are pretty rare these days.