Wouldn't it be easier to make another type of vania instead of classifying it as a metroidvania?
As things are, the leveling up is just something most people will expect from a metroidvania. Some will probably hold some issue against using the term just because of what they expect from a metroidvania game from Konami.
I may be with the minority, but I do like the leveling up system for the games. At the same time I don't mind the game not having a leveling up system and you just sweep through the game like Rondo of Blood (Rondo of Blood I always find myself going back to because of my usual time constraints).
Picking up items only to boost stats I don't mind at all , but the leveling up system shouldn't be scrapped altogether is all. Some of us like myself enjoy that aspect of the game.
Edit: To tell the difference, I usually call characters getting stronger via found Equipment/Items "Equipment based leveling system" or "item stat booster system". When I say leveling up system, I'll mean the traditional kill things for exp, just cus thats what I usually reference to and what most people will think of right off the bat.
Don't know why I felt the need to mention this, but I might as well be clear on what I meant xD