Since the linux version isnt out yet, I am gonna buy this game for windows via download. But, if Frictional Games is stopping to support linux in the future, I will never buy a game from Frictional Games, and say to my friends that it is not worth to buy from them.
BUT, since Frictional Games is supporting linux, I love Frictional Games.. I love you guys for supporting linux, even If I have booted up my windows now just to play Penumbra
Keep making games for linux !