In this game you're playing for the aliens, who have lost their home planet. The goal of the aliens - to find a suitable planet and live there. When the aliens landed on Earth, they did not know that she inhabited. Seeing how people destroy their planet, they decided to help them in exchange for the moon. When you save the inhabitants of the earth, you will have access to the moon. To create the conditions on the moon, you need to create an atmosphere, to find building materials, plant all the plants and animals release.