Need more 2D RPGs? How about one with an open-world to explore and a dark story? Unleashed looks quite good and it's currently on Kickstarter with a Linux demo.
For those of you who like the smaller experimental games, Exit84 is an interesting idea. It's a frustrating typing-platformer game, where you can only move by typing what's on the screen.
All Our Asias is the most recent offering from Sean Han Tani, the developer of Anodyne. The game is a mix of narrative exploration (so-called “walking simulators”) and visual novel styles, although it does not offer branching paths or multiple endings.
Starmancer is a space station sim I'm pretty excited about, it's currently on Kickstarter with six days left and they're fully funded. It has Linux support already and the demo has been updated.
Not to be confused with Abyss Crew that we recently covered, We Need To Go Deeper is a cooperative submarine exploration game currently in Early Access and it just added Linux support.
Northgard is now on Linux as promised, this strategy game from Shiro Games is something I've been looking forward to and it does not disappoint. It does have a few issues with launching the game right now.
The two WWI FPS games from M2H and Blackmill Games, Tannenberg & Verdun, both got an update recently which upgraded Unity for a performance boost and more.