Flight Of Nova is a solo-developed space and atmospheric flight sim currently in Early Access, it looks quite impressive and it now has a Native Linux version. If you love flying sims and sci-fi, you're going to like this, it even has HOTAS support.
Not particularly well known and only has 139 user reviews on Steam but overall a Very Positive rating, so it seems like it's worth looking into. There's even a demo so you can try before you buy. Check out their recent video update:
- Track IR support.
- HOTAS support.
- Realistic gravitation and orbital physics.
- Atmospheric density inspired by earth data.
- Aerodynamic drag corresponding to vessel shape.
- Drag / air friction energy calculations.
- Real-time accurate orbital data.
- Orbital stations and docking system.
- Planet surface outposts.
- Real-time control over spacecraft.
- Full-scale body diameter 12’700 km.
- Search and transport missions.
- Quick flight challenges.
Check it out on Steam.