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May I ask about the commercial method you have ?

Case you can download any game for free, and it's just about copyright. If you are agree with me then you can add a license to the project. 

This will help you get things done much faster + keep earnings. 

By the way, I thing in app purchase is the best commercial method cause it's much more in control and also if someone cracks the game then it's not joyful to play.