Thanks for the feedback, I definitely agree! The ships and meteors were supposed to be a supplemental boost to the world-building aspect, but you are right, at the moment its easier than moving buildings. In an update, I think certain worlds will have a focus on a certain building that you move to the other planets for a bigger boost. At the moment, if you bring a building that a world doesn't already have, it's double points. But compared too shooting enemies, it's not substantial enough of a difference, nor super intuitive- I'll improve that as well.