The Developer of Empire TV Tycoon pulls back his recently released Linux-Version from Steam. The SteamOS/Linux-Icon has also already disappeared from the shop-page. Without further explanation, he posted this in the Steam-Forum:

Linux is not supported Only supported OS are Windows and Mac

and in another post:

some os versions are having problems and we don’t want them to feel cheated so we disabled it from the shop.

Too bad for the developer - I was just going to buy the game. Update: now the developer has even deleted the pinned thread about the Linux-Version.