The app is sometimes buggy, but otherwise playable most of the time. My biggest concern is when playing against my friends, it should allow me to confirm a move before sending it. Sometimes a finger slip or miss click can ruin a game instantly. On top of that, there is no take-back option. You should at least allow people to take back their moves if we there's no confirmation. And lastly, I would like to be able to review previous moves WHILE I'm playing against my friends. Not when it's over.