Gravitational System

The user controls are not that good in this one but you'll get the hang of them

The game is starting in paused mode, to start/stop hit Space

Controls:
w, a, s, d - camera rotation (right click does the same thing)

scroll button click - pan

Mouse left click + drag + release -> planet creation

Next left click is setting the velocity of the planet

Left click on a planet is selecting it
F - following selected planet

Holding N - before creating a planet creates an immovable planet/star

Holding +/- and clicking on a planet adds that planets velocity to the selected planet (pause sim, make a satellite with a stable orbit around a moving planet than add the planets velocity to the satellite so that they can move together )

Left/Right arrow keys - changes the velocity multiplier

Up/Down arrow keys - changes the sim speed