Hi and thanks for your great game. I loved it
So I wanna contribute
If you are open to others help please upload the project to the github and write the project git link so we can help
Thanks
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.