The developer of the exploration climbing game Lorn's Lure is working on a new game named MEGANAUT, a 3rd person narrative horror and now there's a demo available with Linux support.
It's set in the same universe as Lorn's Lure and while the setting is quite different being a horror game, it also brings its own unique floating movement mechanic. From the press details I was sent they said it's "Inspired by Dead Space's zero gravity sections and Abzu's swimming mechanics; it allows for the slower paced tension of horror, combined with the 3D traversal that the megastructure affords".

Direct Link
About the full game:
Your friend Seija, went too far beyond the habitat walls and is now missing in the deep structure.
As a Scavenger, you have some expertise beyond the walls.
You volunteer to search for him.
Features
- Float through a mysterious megastructure with 6 degrees of freedom.
- Thick with oppressive and creepy atmosphere.
- Simple environmental puzzles that don't take you out of the atmosphere.
- Some jump scares.
- Discover deep lore beyond the main story arc.
- Concise experience, roughly 2-3 hours of play time.
You can try the demo from the demo Steam page.
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