There is the reference sheets I did for my team game "Adversus Alium" for the Ludum Dare Game Jam [https://ldjam.com/] wich I did with my partners from my university!
Adversus Aliuym's plot:
You are a soldier who defends a bunker from an ailen invasion ry to mantain an indefese small alien alive that you called Pinky.
Protect him at all costs before the bad aliens kill you and your new strange friend!
Link to my Ludum Dare game's page: https://ldjam.com/events/ludum-dare/46/adversus-alium