The recently restarted development work is focused on Linux, but the game historically ran on all the major OSes including Mac and Windows. You could either do

The recently restarted development work is focused on Linux, but the game historically ran on all the major OSes including Mac and Windows. You could either download an older release for those platforms or wait for someone to get it building again. Or try yourself ;-) (Vega Strike, among other things, had been stuck with really old versions of the ffmpeg/libav API and Python 2.x, so the first goal has been getting the code working with modern libraries, cleaning some code cruft, and generally tidying up)