Too many ads
You get about 10 seconds of play before you are forced to watch a 15-30 second ad. If you want to upgrade anything for free, another 30 second ad. 10 second play, 15 second ad, 10 second play, 15 second ad, over and over. After about 15 minutes i couldn’t stand it anymore and deleted the app. Too bad—the actual play time was fun.