Check this game out It's 30-40mb max, was made for DOS pcs, and would be frikkin awesome to have on iPhone/iPod Touch. The source code is available. *My idea is for a port that includes only the shareware version files, but allows you to expand it with the commercial release files if you have them.* Controls, in my mind, would be similar if no the same as Cube, with a few minor differences, ask me. What think?