This is a minor thematic issue, but does it seem odd to anyone else that each turn only represents one week? Am I supposed to believe that the population of my colony just doubled in 6 months? Those are some prolific breeders.
The time-scale of the game just becomes ridiculously compressed due to this fact. A standard length game would only be a handful of years (5 or 6 usually). That's a pretty short time to colonize and conquer the galaxy. I feel like each turn being a month would be more reasonable. Or better yet, just call them "turns" and let the player use their imagination to decide how much time is passing.