Steam has added a
new built-in Wine feature that allows you to install and play Windows games
You have to opt into the Beta, and specific instructions to enable this feature in the settings can be found
here). Cogmind in particular has undergone extensive playtesting under Wine and the experience is on par with the Windows version, so if there are any issues it'll be on Valve's side, but even though it just launched it seems to be working fine already.
We already have a bunch of Linux players, though most are using the DRM-free version sold on the GSG site. If you're a Linux player currently using that version and would like to install and play on Steam, shoot me an email at gridsagegames@gmail.com to receive your key.