The bigger the asteriod, the better. Goo must arrive at the base to be spent. Therefore, one must gather it from one's goo mines. And destroy other goo mines while at it. Ships therefore must have goo cargo holds.
Tugs can carry more with their pods.
Points are rewarded at a stready rate for goo production. Points are also awarded for killing others. Different selection of available ship and base classes. Upgradable to larger bases. Generate some resources.