The previous section hints at something pretty important, but maybe non-obvious: I assert that MetroidVania is not a genre, it’s a framework - a way of structuring games and most specifically the worlds they take place in.
And
This realization that ‘MetroidVania’ is not a genre helps explain why a game like Batman: Arkham Asylum can be thought of as a MetroidVania where its sequels wouldn’t be, even though almost all aspects of the gameplay are very similar.
And
Never thought about that second quote like that before, but it explains why I loved Asylum and noped out of City after like, an hour or two