In my personal opinion I would say Infernax developed by Berzerk Studios (same guys behind The Breach btw) which is a metroidvana in the same style as Simon's Quest and the Adventure of Link. What Infernax has what those games lack are a morality system that dictates the end of the game (Slay the skeleton or spare him? the choice is yours) and buckets upon buckets of 8-bit gore