I really don't understand the concept of running out of lives and then why it takes 20 minutes or more to refill? It's not enjoyable at all. Secondly, some of the upgrades are so expensive and we should play a lot of levels for just a small item. At last, it's innovative to try to load an ad for two more lives and then it says that it crashes. quite often we load ads and then the reward is lost. Stop with this useless end of lives. Otherwise the game is quite enjoyable with grade graphics