Controls:
A,D: Rotate
Shift, LCtrl: Throttle thrust up/down
x: Kill thrust
Tab: Change trajectory view mode
F: Change camera mode (fixed or tracking)
<,>: Slow down/Speed up time warp

Gameplay:
Your objective is to travel around the system retrieving astronauts (blue circles), then return them to the home planet (highlighted with blue circle when all astronauts have been picked up). Fuel is limited, but can be picked up orbiting bodies in the solar system (orange circle). 

Level Editor:

There is also a level editor where you can create your own solar system and export the level to play! Everything is adjustable on the left console in it. Make sure to have at least one planet marked as "home" and one astronaut to make the level winnable, try playing around with masses, orbits, etc.

Credits:

Main Menu music:

Universfield: https://pixabay.com/music/ambient-ambient-space-background-30s-342767/

Gameplay Music

Leberch: https://pixabay.com/music/ambient-space-ambient-509783/