This seriously serious, click one or all to get free software, free design guidance, free free free!
30 Day to Launch Phone
Check out Microsoft Research article at:
Question: Does it prove that Microsoft eat humans? No.
I do want the rainbow colors that they show in the image explaining the way the keyboard works, that is trippy.
How the phone keyboards design are made usable:
And this link is to a discussion of a text based game, might be a good basis for a game that you are thinking about: