itch.io

 Sorry, but I don't understand this question, but there is a version, in any case, you need to start by unzipping the files.

Just unzip the archive, open the terminal in the folder of the game and run the game script (the command is "./SpacePrison.sh")

Or you can just right-click the .sh file and make sure that the permission to run it as an executable is enabled. After that just double left-click it.