I have just finished brainstorming and I have a concept.

It is the year 2347, Earth is running out of power, fast. You have been sent into space by the government to look for alternative fuel sources from other planets or moons. You land on Aegaeon, Saturn’s smallest moon (diamater of 500m), which has been emiting high levels of Zevatron Radiation. Zevatrons are a new power source that has recently been discovered on Earth. (One ounce of Zevatron liquid can power a city the size of New York for a whole year.) You land on Aegaeon and start farming the Zevatrons. Whilst you are farming the Zevatrons you are attacked by some inhabitants of Aegaeon, you have to fend them off whilst you are farming.

Screenshots coming soon.