Capcom created a Metroid-style "prequel" to their next-gen game Dark Void, called Dark Void Zero. It is a 2D jetpack shooter, complete with period box art. I haven't tried it yet, but the DSi version has a higher Game Ranking than the next-gen game. It's available on DSi, iPhone and PC.
It's available for PC on Steam ($4.99!) http://store.steampowered.com/app/45730/