I've been really excited about this game and would really like to play with some friends, some of us don't have Windows. I would suggest Linux(Ubuntu) please.
Linuxs/Ubuntu is kind of problematic beacuse it's not an "normal" system It won't certainly come out shortly or ever Won't your friends try to have 2 systems at once? I got windows and ubuntu on a laptop before and it was O.K.
Linux is certainly the most "normal" system nowadays, outnumbering Windows installations by at least 4 to 1. Remember that Android is Linux too. People don't want to babysit crashy computers anymore.
Porting your game to multiple platforms is the cheapest way to increase market share. Especially considering how easy it is nowadays with libraries like Qt. People can't buy your game if it doesn't work.
Seeing as it's been almost 4 years since the release of this title, a linux release might be just what the game needs to revive itself on Steam.
I guess a Linux release of this game is a great idea. It would ease the Linux user if they want to play this game.