Dust: An Elysian Tail, released originally on XBLA in 2012, is one of my favorite metroidvanias in recent memory. The fact that it was developed by one guy, basically, is still insane to me, given how deep the game is mechanically. Now, it's coming to iOS "very soon," with customizable inputs and cloud saving, with universal support for iPads and iPhones.
It's just a trailer, but the game seems to be running very smoothly on iOS. I'll be checking this one out for sure as I think this game deserves the support.