Monsters in the background

First of all, the graphics are really smart on the Nexus 7. But that was it for now, because the game can not be switched off and running in the background ressourcenfressend just continue. Again and again strategic pop ups of the provider, where various things are offered for sale. Without these expensive in-app purchases, the game time will be longer, such as completion of buildings by far!
Also, the data access is already powerful complex and absolutely questionable why must so much equipment espionage.
These resources robber I do not like. Deleted.
For me the question and bitter aftertaste remains whether Ravensburger has really necessary ........