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So... No Mac version? Is one in the works? This looks like an interesting game -- it seems odd to have a Linux version and not a Mac version.
My linux installation of the game contains a folder named osx64 and there are some OSX libraries and a game binary but according to a post on steam forums it does not yet work properly.

http://steamcommunity.com/app/282590/discussions/0/34095131891972021/