Looks pretty, but... I won't give my kid an ad supported game to play with. Not sure why that is hard to grasp for developers. I will happily pay $10, $15 for a valuable, well developed, educational game for my kids. Also this game has not much replay value and the letters turn too much and cover up the lower spaces.
Persistant advertising Fun puzzle, however, I have a notification icon that won't clear!! It advertises another of their apps. Most annoying.