Metroidvania is a nice term explaining a type of game. it's exclusive to games in telling you what it is. You know what it means when someone says Metroidvania, I think it's a silly to be put off by that term. finding out a new way to say it just puts more work into something that feels so well established.
if it isn't that, you're just saying adventure game, and then how often would you feel the need to explain what type of game it is, further.