I have to recommend Ascent DX - it is free, quite short, but it condenses everything I enjoy about the metroidvania genre I to a bite sized play session.

Tunic is one of the best games ever made, nevermind just in the metroidvania genre

Phoenotopia Awakening was stupendous fun and way bigger than I thought it would be. Strongly recommended.

Death’s Door was so damn fun, and it felt quite fresh in a way I can’t describe

AAAAXY was a lot of fun, and free and open source. Sort of like antichamber meets metroidvania

Otherwise, as others mentioned, I can’t recommend these enough!:

Hollow Knight

Ori And The Blind Forest/Will Of The Wisps