The Ultrablast HD game is now available at the Macgamestore (http://www.macgamestore.com). It requires Mac OS X 10.6 or higher and costs US$4.99.
Here’s how the game is described: “Follow the story of four characters as they investigate a mysterious phenomenon affecting their home planet. Perhaps you will be able to solve the mystery. By shooting things. And lots of them. Ultrablast brings old-school shoot’ em up action to your Mac. It will remind you of the good old painful days of arcade gaming.”