Want to pick up some games made in Poland? DRM-free store GOG has a couple of nice looking themed sales going on right now.
The first in their "Made in Poland" sale, where as the name suggests, games of all sizes can be picked up from Polish developers. Some pretty nice looking deals there like 90% off The Way, 80% off Moonlighter, 70% off Children of Morta and more. That sale lasts until November 14th.
On top of that there's a Multipublisher Sale featuring games from Nival Interactive, Raw Fury, The Irregular Corporation and Wired Productions with deals up to 85% off. This one lasts until November 16th.
Plenty of their games have Linux versions, and you can also try using the Heroic Launcher to some of them with Wine which will work quite nicely for a lot of what they have.
If you do find a good deal be sure to leave a comment.