I told you, bro. This dev probably has ADD/ADHD and he loses interest half way through ALL of his games. Then add in mediocre shit endings and there you have it.
He always starts out strong, so I know he has it in him to write an amazing game. But, somewhere about half way, he always loses focus and this is what happens.
It is unfortunate. I am a story writer myself, not AVNs, and always have the full framework of a story built before I ever start writing it. Sure, somethings do change along the way. However, I pretty much know the story arc(s) and ending before. It is certainly not the only way or even best way for every writer, it just works for me. The problem with some writers is they just either get bored, run out of ideas, or yes start thinking about a new idea (ADD/ADHD).
If I am trying to make money off of something, I sure as hell will make sure I find a way to properly end it. Even if that means getting someone involved to help flesh out the story. Personally I will not support anything by this author in the future. This wasn't the first AVN that he has done this way. If it was, I would give him a second chance.