It is interesting to see so many different views on this game. I mean, aside from any personal opinion, this game excels at the render and animation quality. A lot of the other aspets, such as the girls models, type of humor, writing, character interactions and so on are very subjective to taste. It is a porn novel, afterall. As far as i can see, there is no obligation to make the writing feel complex and natural as it would be a real person there, as well as there is no "realistic" tag marked. This can make people love the type of humor, or hate it, and the same for other points listed.
As a movie dictates what it wants the viewers to see/feel, by creating scenes a certain way, the same scene can be deeply loved or hated. A certain aspect can be impressive for me, and not even remotably fun for you. Its art, and even porn games do qualify as art.
Now, about the main topic in hand, taking 9 months to deliver an update might be considered a lot for some, and a proper time for others, depending exactly on their expectations. Same goes for 5K a year, which looks like a lot for some regions, or a very limited amount for others. If the Dev made 10k in his latest job, for example, 5k would not look ideal/enough. If the Dev had the ability to write an exceptional story, would he use it in a porn game, with such a limited public and funding? It is very relative, and also very hard to criticize why some people do pay one and not the other Dev.
Knowing a bit of the Top 3D games in this website, and now sharing my opinion, this game is very well above average in terms of renders/animations, and is a bit above in terms of interactions/writing. It is more of a "porn drama" than anything, as it does not want to feel realistic, only to insert yourself (as the MC) in a reality where your problem is getting a huge dick and a very horny family. It does feel corny and absurd, but it does seem on purpose XD.