When the game will be available on Mac os X on Steam? Because I had a game on windows computer, now I have Mac, and I can not play.

Oh no! We don't have any immediate plans to try and support the game on Mac . But we will make a note that another user has requested this support.

Hey, I am interested in this game as well. I have this on my Windows Partition on my Mac Pro. I do believe my hardware requirements would be fine with it on the Mac side if you make a build for it. I have a Nvidia Titan X of using 12GB GDDR5 VRAM also two Xeon 5690's.