Yeah I bought it for Linux, but after purchase the main page was changed to only say windows :(
EDIT: I have contacted support
Have they said anything? I really want to play it, specially since I've heard that its like system shock 2 but not extremely frustrating.
While its not supported on Linux by GOG currently, it should be possible to play. I have it running well on MacOS using Wine (even with Kentie's launcher!). I don't know how to setup Wine on Linux, but there is no reason why it shouldn't work.