According to this tutorial:
“Restart the game by closing the window (or press Escape) to exit, then select Project ▸ Build from the editor menu.”
I can’t close the window using the escape key (maybe because it’s not defined in game.input_binding?), is this supposed to be a default action? This is on Linux Mint 18.3.
Also spotted a typo:
“Try moving the space ship with the arrow-keys on your keyboard. Notice how the it moves faster now.”