WASD to move, mouse to look, space to move up, control to move down, shift to toggle boost
Tab to open main menu, Q for spawn shortcut, E for the empire menu, R for object editor, T for time control shortcut, U for fullscreen
Left click to use GodPower, Right click to zoom/use secondary GodPower
1/2/3 to select GP category (editors, weapons, physics)
Scroll to select specific GPs
If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).