Zoom to the moon

Backstory Year 2678. It has been a couple hundred years since humanity started populating settlements on the Moon. We live in the era of space exploration and development. The excitement in the space and aeronautics communities hit its peak when the Ulnods, an alien species first contacted us. Soon enough we found out that their intentions were not so kind, and after a few failed attempts by diplomats trying to reach an understanding, the Ulnods began the hostilities. First they attacked and destroyed the Moon, and now they are coming for the Earth. This crisis calls for desperate measures. Yo...