Oh I wouldn't recommend this one on GOG. It has a very very nice gameplay idea, but everything else about it is really bad. Techtree scrolling - bad, techtree composition(effects) - bad, descriptions - bad, planet management - repetitive, ship designs - bad, interface ergonomics - bad, sounds - bad.

And music - music is really great. Music and gameplay idea, but everything else is ... well, I don't like it. Even if I played it a lot in my childhood, it needs full rewrite. Great candidate for someone who wants to try the pen publishing first FLOSS game.