This does not even qualify as a game. There is no story. You go from stage to stage attacking monsters without rhyme or reason. In battle, all you do is swipe your finger around the screen and your characters attack as a result. Thats the "gameplay." No strategy, no challenge, just grind levels and outlive your opponents. Thankfully they removed the $4 cost for this game, but there is still about $40-50 of premium content if you want the full game. In addition, if all your characters die in battle there is a 99 cent charge to continue the fight, or else you either start over or wait three minutes per character to recover. This can take over an hour and a half!
Take a pass on this. Play ET on the 2600 instead. At least that has gameplay and a story.