I am the owner of GamingOnLinux. After discovering Linux back in the days of Mandrake in 2003, I constantly came back to check on the progress of Linux until Ubuntu appeared on the scene and it helped me to really love it. You can reach me easily by emailing GamingOnLinux directly. Find me on Mastodon.
Based on the EDuke32 game engine, NBlood is a new open source port of the classic FPS Blood. From what Voidpoint (Ion Maiden) said on Twitter, it's using their version of the game engine too.
Showing some good post-release support, Kite Games and Kalypso Media Digital have pushed out a free content update and a new DLC for the strategy game Sudden Strike 4 today.
City Game Studio from Binogure Studio will have you run your own game development company, this one was actually developed on Linux using Godot Engine and other FOSS tools.
While 9 Monkeys of Shaolin did have a pretty big delay, Sobaka Studio have just recently announced a new release date (including Linux support) along with help from Koch Media.
Hell is Other Demons from Swedish developer Cuddle Monster Games and publisher Kongregate might not be out for a few months yet but it sure does look exciting.
For those players who picked up Surviving Mars outside of Steam through stores like GOG or the Paradox Store (to use in the Paradox Launcher), you can now add in some mods.