Is that Metroidvania should be subgenre of Platformer?

Random check definition in this sub. And just felt it lack of sth. My thought is all Metroidvania things is belong to Platformer. Don't get me wrong, i am not purist and am fine with graphic 2D,2.5D,3D. But all games in this genre I've played has run-nd-jump inside a room space with gate.

Did i missed sth or is there any Metroidvania that not Platformer?