The link above it pretty much all the story. Despite "porting the game to mac/linux" was the last one on the backers wishes poll (hey, could we - *nix users - be more active on this, really?!) game developer write that they're going to proceed with porting in case an unknown "porter" they're in contact with would be able to do the job within available fundings. Looking at the poll results one could find that most users either rated mac/linux port to be extremely important or not important at all. Not surprisingly, indeed.

So, Michael, don't you think it's work writing a small news article on this game at Phoronix main page? And, BTW, don't you know who is that mysterious porter game developer are referring to? Maybe, "icculus"?