Casual, needs polish
Tried it. Nice little Mahjong with one relatively easy layout. Should be Retina on iPad, but it isn't. Mahjong is one of the games where I am incredibly fast because when I was in hospital some decades ago I had a lot of time to train it.
The controls are not fast enough for me (rank #2 in Game Center). Sometimes it doesn't recognize my tap fast enough. Gameplay-wise there are some special stones but pretty basic otherwise. Be careful to shuffle in time before there is only one pile with two stones left.
The competition is enormous in App Store. One of my favorites: Mahjong Artifacts where you get special rewards (optical and acustical) when you are fast.