Heroine Anthem Zero by Winking Skywalker Entertainment Limited:
https://itunes.apple.com/us/app/apple-store/id1274907797?mt=8
A 2D action platformer with pretty decent art going by the screenshots.
Yeah this came out months ago on an accidental release and I picked it up then. It's actually a console port (also have it on PS4 but decided to go mobile as I hadn't had time to play it).
I'd describe it as a side scrolling action RPG as opposed to a platformer. Full fledged story, wonderful art and plays well on mobile.