Astrov prototype version 0.1.2; Simply extract anywhere and play.
Currently options can only be changed in the main menu, so it recommended to check before starting free flight mode.
If this is your first time playing I highly suggest you enable the tutorial within the main menu and follow the provided steps after launching to space. Bear in mind that you have to press the displayed keys at least once to proceed.
Outside of the in-game tutorial, you can also refer to the included keybinds for reference.