I just found out about the game today (I have no idea why I missed the Kickstarter back then) and was really glad that it's still possible to get the physical version!
Just for confirmation before I back, as I didn't find any specific information about it: I guess the physical version will contain the game for all platforms (i.e. Linux, Mac and Windows) on the physical media, and those will be DRM free versions (i.e. not require Steam to install or play the game), correct?