Orbitous

Gravity is everywhere. Use sling-shot maneuvers to your advantage and shoot projectiles on curved trajectories. Gravity can guide you, but it can also be your downfall.

Nothing is stationary. Every star system is fully simulated, constantly orbiting around the black hole in the center of the galaxy. Watch the worlds around you collapse, explode, and merge into new ones. 

There is no safe place in this galaxy. The Network is constantly hunting you down. And even if you think you've found comfortable ground to land on, there's no guaranteeing the endless tides of gravity won't wash it away.

Build better weapons to progress. Take an ordinary bullet and modify it into a shotgun, increase its mass until it's large enough to host orbiting projectiles, or add a field of heat to burn nearby enemies. There are many possibilities, and most modifiers are stackable.

Real time physics. After a bit of procedural generation, your fate is left to entropy. Watch lively worlds burn, your favorite shops be demolished, and the stars that once guided you burst into a thousand pieces.