The Binding of Isaac: Rebirth got rejected from the iOS store.
http://kotaku.com/the-binding-of-isaac-rebirth-rejected-by-apple-due-to-1757647059
I'd LOVE to see this come out on Android, but I'm not holding my breath.
I beat mom on PC for the first time with the Afterbirth expansion this weekend. I had done it a couple times on PS4 in the base game. I really love the game but I wouldn't have bought it for my iPad even if Apple had allowed it. It is a very difficult game and I can't imagine trying to play it with touch controls.