Do you like survival games, how about one that has both a single-player story and a general survive mode? The Long Dark might be what you need and it continues to get better.
While not exciting as the huge new patch that's still to come, it's still fun. Stellaris: Humanoids Species Pack has been released along with a small patch today.
Airships: Conquer the Skies has added a rather interesting system to let you play back past battles using a new replay system, not only that, you can jump back in to actually play through it.
Darkest Dungeon is about to get darker with a new DLC 'Darkest Dungeon: The Color of Madness' involving an alien shard that's crashed into old Miller’s farm.
Here's one we totally missed which looks very interesting. Just One Line is a fantasy gamebook-like RPG that's currently in Early Access and it supports Linux.
A feature that was often requested by Linux gamers, was a way for us to show developers there's a demand for a port. Valve has delivered something interesting to help.
Bridge Constructor Portal has been officially announced today, this next title will blend together the well known engineering from previous games with Portal.