User blog comment:Matt Hadick/Guided Tour: Metroidvanias/@comment-452-20140424034823

One of my favourite recent games in this genre is Aquaria (available for Windows, Mac, Linux, Android and iPad)
 * Introductory hand-holding, then it's up to you to explore.
 * Auto-map with bookmarks
 * New areas open up after acquiring new abilities
 * A variety of different areas, each with unique visuals, enemies and music
 * Full access to backtrack through all areas, with new shortcuts later in the game
 * Plenty of hidden stuff to reward exploration
 * Story is basically optional if you just want to kill things
 * The jellyfish look a little like metroids

There's an aquaria wiki, but it needs some work.