If you're looking for a Metroidvania on mobile, and want a terrible translation to go along with it, Dungeon X Dungeon [$2.99] is the game for you. This game first popped up on Android last year, stunning with its pixel art, before getting release on iOS this year. The game throws in a variety of weapons and abilities for the player to use in their quest to escape the massive dungeon they're trapped in, but some clunky controls and a bad translation that leads to confusion make this a mixed bag of an experience.
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You play as Luke, a treasure hunter thrown into the dungeon by an evil pope. There's something about an ancient evil in the dungeon that will be awoken, so you have to escape and also possibly deal with that stuff. Meanwhile, a couple of allies come and go, and will either help you on your way, or get stuck and then you have to help them. They "why" of this is all so confused because Dungeon X Dungeon has a terrible English language translation. While this sometimes leads to comical moments where the tone is perhaps rougher than intended, as the protagonist just delivers absolutely stunning burns to his allies for their faults. The problem is that the bad translation makes the story incoherent and leads to issues with some items. I couldn't tell you what they do, and why you should equip them. Even the moon system is described in confusing text to where you can't understand it right ...