Good but the ads are extremely intrusive, I don't have a problem with the ads for resources. But when it plays ads while performing basic actions like opening new tiles it really starts to grate, because it wants you to watch ads to get the resources that spawn around the planet, or to get bonus resources from the item upgrade points. I could very easily spend more time watching ads than actually playing the game, and that's a real shame. You can pay the ads away but I'm not sure its worth it.