Arrow keys to move around the scene

Click on a spawn button to spawn that planet.

Use the settings on the right side to create your own planet.

Use the slider bar in the bottom right to control the timescale.

Plus and Minus keys to zoom in and out.

Backspace to reset the zoom

R to reset the scene

X to explode a planet

C to delete a planet

Z to hide the HUD

Hold M while your mouse is over a spawn button to spawn it in rapidly.