Just in case someone wonders if this is being worked on, MZ uploaded a 0.9.12-1 package at mentors.debian.net[1]. He's just waiting for a sponsor to upload it to the main archive. If you want, you can dget the dsc file and build the package yourself.
Regards, Job Bautista [1]: https://mentors.debian.net/package/endless-sky/
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