According to what?
Games are entertainment, they are designed especially to appeal to the flesh. To make a 'game for God!' is to take something of the flesh and make it something "holy."
I'm not saying games with Christian ideas are bad, but a "game for God!" is just silly. How can one make a "game for God!"
I can just hear God right now:
Oh, joy..a game just for Me. The Mission is fulfilled!