At first, the game is fine, until about level 50, where it quickly becomes more difficult to play. At that point, most levels are almost unplayable, as they are too difficult. This would be fine if earning back hearts and getting items to help out was much easier, but this isn't the case. The game is imbalanced. No casual game should be so difficult so quickly. At least level 75 should be where the game gets more difficult. There's also too many ads and pop ups to make in-game purchases.