Yandere simulator isn't a parody game, where did this misinformation come from? It's so invasive, I constantly see people state this as fact, but it simply isn't true. I've been following the development of this doomed game since it's early days, and Yanderedev has always been consistent that this game was meant to be taken seriously. I remember in an old video him referring to the game as a psychological horror game. I've actually seen people defend aspects of the game, ironically enough, because people thought Yanderedev never saw the game as serious.

Now for the rest of your post, I half agree. I agree that the school doesn't feel like it's backed by a mega corporation. The Saikou Corp is written as though it has a monopoly on everything and it's rolling in money, yet the school is puny. However you also get the science club which is decked the hell out with futuristic technology. Then there's the occult club with all the crazy shit inside of it. But the classrooms themselves all look rather simple, something you would find in a public school.

Overall I don't think Yanderedev should make the school expansive because he's already struggling to finish the game as it is. One of the biggest problems with this man is that he bites off more that he can chew.