I bought Ground Control 2 for 1,5€
Good game, very good price, still playable in terms of looks. (obviously bad graphics, but "sharp" enough)
I want to find more old games I've forgotten about - just noticed the have Imperium Galactica 2 too, even though I'll probably not get it because I have more more modern space games I like playing (Stellaris, Endless Space 2)