Hi All!
There is an Open-Source program called Zero-K.
It is also available to Linux.
Link below:
https://zero-k.info/Wiki/DownloadLinux
Video:
https://www.youtube.com/watch?v=24jFVuVm01E
I belive that the store will be more popular if more games available.
Because there are many hidden treasure and this is one of them.