The Descendant is an adventure game that is divided into episodes. The story starts with the end of the world, and your job is to protect the remains of humanity.
Here is the description of the game on Steam:
"THE DESCENDANT is a five part episodic adventure game series where the end of the world is only the start. http://www.descendantgame.com/ After climate change wrecked the planet, a man-made extinction event wiped humankind off the face of the Earth."
You can find more information about the game as well as buy it here.
Lastly, here is gameplay video: