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People may complain about other people´s complaints :D
I think the game would be too easy if you could keep all your upgrades forever... dying 3-4 times makes the game already piece of cake! A cool...
I never play 30min session! When i finish a level (or if Im at work) I just put the app on standby and come back to the game once I have time......
My 9yr old cousin loves this game ! Even managed to finish 5 levels!