The just released so called "Sagan"-update to the management/building game Surviving Mars finally fixes the long outstanding startup-bug on Linux and adds challenges among a lot of other things:

For the RPG Pillars of Eternity II: Deadfire the huge Update 3.0 as well as the new DLC "Seeker, Slayer, Survivor" has been released for Linux on GOG and Steam.

About the DLC:

Victory At Sea Pacific, the new RTS/Tactic-game from the developers of Man O' War: Corsair and Victory At Sea, is now available for Linux on GOG and Steam.

The Patch 1.6.0 for the Action-RPG-game Hand of Fate 2 adds big changes the combat system and balancing:

We're proud to release our latest update to the game, 1.6.0, which brings a whole suite of changes to combat. Batter your foes, unleash the power of your artefacts and enjoy enhanced manoeuvrability with Hand of Fate 2: Combat Reforged!

Bash Abilities

A new (paid) DLC for the management-game Railway Empire is now available for Linux on GOG and Steam: The Great Lakes.

The new SciFi-Adventure State of Mind from developer Daedalic is now available for Linux on GOG and Steam!

When mind and machine become one – what will remain of humanity?

The Patch 1.10 for the strategic tactic game Sudden Strike 4 has been released.

It finally adds among other things customizable key bindings:

Update 1.10 for Sudden Strike 4 has been released!

Commanders!
In this update, we brought you usability changes, feature extensions and skill balance changes.

Find more details and the full list of changes below: