Good game but way too many pop ups trying to sell you in game items for ridiculous prices. Beat a level and collected a star? "Are you sure you want to miss this deal for $10?" Skip and hit back "buy this ship for $50!", go to another screen "list of items on sale!" Every so often it asks you to rate the game and if you enter an unfavorable star rating, it just says thank you and fires back to the game and it asks you again a few days later and just repeats.