Free is free. All it costs you is the time downloading the app and the 130MB+ space it takes on your Lumia 920. I can't find too much to complain about here. As far as the controls are concerned, I haven't played it that much to find any major faults with it. I guess once I get the character going at full speed and it doesn't respond to the swipe up to jump and I die I will get pissed.