Super Metroid will always be my favourite. I also enjoyed Axiom Verge and Bloodstained ROTN.

I generally like shorter Metroidvania like Iconoclasts and some of the Shantae series or even Yoku’s Island Express which has some backtracking.

The Metroidvania tag is a bit like Dubstep in music, a lot of those Dubstep tracks aren’t Dubstep but they can still be fun for some people.