It's kind of funny reading the last 10 pages of this thread. People saying the game got boring and blaming people who didn't want NTR. (I agree Chapter 4 is lackluster). Here's the simple truth, more optional paths = more work /= more SS money.
You can look at any of the creators Patreon or SS and see that the vast majority of the money comes from people who like "vanilla" relationships or harem with no other males. Yeah, it sucks for people who want to see more varied or exciting content, however from what I seen of this games development, MrDots is trying to make "his" story while making sure he doesn't alienate his SS audience. (which is perfectly normal).
All I can suggest is try to seek out games with the content you like and supporting them (even sharing them so more people discover the project), I personally want to see more non-vn adult games so that's what I support.
As for Chapter 4, it seems like the storyline wasn't planned at all after Chapter 2, with Chapter 3 working out somehow. (although it took a long time). So now, they are kind of just filling it with content for the sake of content. I hope the new update brings back some excitement back.