Put a demo in Ubuntu’s official repo, and have the demo do the work of adding an authenticated repo when you buy it?

Also, provide a simple shell based installer for us Slackware folk, and other linux distros, packaged as a “.run” file with self contained installer. (No RPM’s inside! only standard formats)

On another note: The game looks interesting, but I would be put off by the graphics. The itch to play retro games can be achieved by installing an emulator. (The graphic I’m most drawn to is the player character, who looks quite out of place standing there)

Maybe they could distribute via http://www.mygamecompany.com/linux.htm