It was fun at first but once you get to level 20 theres an option to get to the next planet and without any warning you lose all progress, resources, money and work put in. Second major gripe is the price to unlock things is way too expensive. 15 to 50 dollars to unlock in game items seems steep for a mobile game and i might have been open minded to unlocks at $5 max. They also meter ads after a while which to me defeats the point of offering ads for items in the first place.