After getting a Linux Beta build back in December, the open-world space action and adventure game Starcom: Nexus continues getting polished up for Linux support.
Grundislav Games along with Application Systems Heidelberg have announced Rosewater, a wild west adventure set in the world of their previous game Lamplight City.
A game I completely forgot to cover some time ago is Planetary Sanitations Inc., a free and open source roguelike that has you exploring different worlds.
DASH (Danger Action Speed Heroes), a platformer that's built for people who love creating and competing across user-made levels just recently expanded with a big new online multiplayer mode.
If you have a Wacom-style graphic tablet and you need a simple and distraction-free painting program, MyPaint seems like it could be a really good fit.
Now that the huge update to Slay the Spire is live adding in The Watcher as the fourth character, Mega Crit Games have also updated their opt-in game engine upgrade Beta.
A rolling-ball physics platformer where you move like slime, jump like a bouncy ball and swing using a sticky tongue like a weird version of Spider Man. Crumble has a lot of fun ideas going for it and a big demo update is out now with co-op.
Gamesbymo have announced that A.N.N.E, the crowdfunded mixture of metroidvania style platforming with space shooter elements will get a big 1.0 update on May 20.
The team behind RetroArch, the open source and cross platform frontend/framework for emulators (and a lot more like open source game engines), have stated their plans for handling the various emulators it works with for the Steam release.