Looking at the start screen I see these two techs. I think of Colonization as giving me the ability to colonize and Planetary improvements the ability to improve the planet. But Colonization is a Main tech tree, and Planetary Improvements gives me the ability to colonize.
Shouldn't these tech names be switched. Giving the player the idea that if I want to improve the planet or deal with planet things select this tech category. Right now when I look at the initial races I see that every race has colonization, but Iridium and Drengin do not have the ability to colonize planets at the beginning of the game.
Suggestion: Switch the names of these two techs.