The INSTALL file references a guix.scm file but it's not included in the archive. You may have simply forgotten to include it? If I can get that file I should be able to easily try out your game.
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Hi, I can't edit the submission unfortunately, so I added updated tar to the repository in the branch Tar. You can found it here https://github.com/kierros/birb/blob/Tar/birb-0.1.tar.gz :)