That game in the OP looks straight up like GBC Zelda
When you consider that SotN was actually inspired by Zelda, you realize that you can consider a lot of action-adventure games as Metroidvanias because they have new abilities that help you progress. Castlevania really didn’t add much to the genre at all and the only reason why the term exists is because its latest games at the time played like Metroid so it was a pretty evocative term
Therefore, they are all just adventure games really that take from Zelda or Metroid in certain ways. However, I do think that the 2d sidescrolling part needs to be considered or else the genre would be way too broad. Lately, there have been way too many games that are defined as Metroidvanias for a selling point but in reality they don’t really scratch that itch. There’s a bunch of 2D indie games that are just Zelda (or action RPG/Souls) but people will say Metroidvania because that’s the trendy term. As for 3D games, you could say that they are more rare on that aspect but I don’t think it’s that true, it’s really not that uncommon for a game to give you new abilities. Like, I’ve seen people say that Ys VIII was part Metroidvania but that’s really overselling that game quite a lot. So if you start propping up random 3D games that include new abilities that help you progress that kind of dilutes the term because how many of those have a structure like Metroid Prime or even Zelda.
Even on the 2D sidescrolling side you have games like Shantae which is just sidescrolling Zelda but they will be labeled as Metroidvanias for lack of a better term, or Blasphemous which is just 2D Souls. When you have Super Metroid’s map people won’t ask much questions on that aspect really. Even then, I think it’s still fair to include 2D sidescrolling despite that some games will still be mislabeled because you do have some people that prefer Castlevania to Metroid, so when they think about the genre they don’t really consider the aspects that define Metroid (interconnected world, ability gating). Therefore, while all games under this umbrella won’t necessairly scratch the same itches they are still clearly cut from the same cloth, including 3D and isometric games would make it way too broad