The game has huge potential and could easily have 50 more scenes before even introducing the endings.
If a developer doesn't care much about their creation, why should I care and support them financially? It makes no sense to me.
This is something that a lot of people, at the very least those who are not involved in the production of media or similar content (such as hentai games parodying a decade old series) might not understand.
Creating something takes a lot of work, and it is not just physically draining as you need to spent hours and hours sitting on your computer wracking your head, but also mentally exhausting with as your mind goes through every piece of criticism you can come up for your work, already seeing the inevitable hate comments you will get for making it.
It's not that Fujino, or any other author of the medium, have no passion for their own work. 50 (big) scenes could take him another 4 years of work.
Fujino might be passionate about the game, but it doesn't mean that it is the only thing he ever wants to make.
You can see examples of what I'm talking about in real life with famous actors of successful TV shows/movie franchises.
After yeas of working as the same character, eventually a lot of famous actors quit because they want to do something else with their lives. Time is limited in this life, and spending years of it on a singular project is not as easy as some may think.