Starts out pretty fun but the difficulty scales up ridiculously quite quickly as a clear play to push players into microtransactions to progress without extensive grinding of earlier levels to eke out a tiny bit of progress after days or weeks of playing the same missions repeatedly and constantly bombarding you with pop-ups for "deals" on premium currency, heroes, pets and so on. A good example is that you "unlock" pirate hero but it really just unlocks the ability to buy him. Trash.