This is a really great concept for a game but the execution is really lacking. The potential to be great is there but it's way too short and like so many have said, there are a ton of ads, even if you pay for the no ads version. They are required to progress to certain points of the game and the upgrades all have an ad option so you could beat the game without ever actually "playing" the game. I purchased the no ads version and was refunded within a few days with no explanation????