Carl is outside in his boxers trying to get his girlfriend’s cat out of a tree when everything with a roof on the planet is destroyed and the smaller number of survivors are made to compete in an intergalactic dungeon game similar to D&D. If this sounds kind of dumb, I described it correctly; it’s kind of dumb. It’s also fairly entertaining and has a good amount of heart. People who have played any sort of role playing game, like World Of Warcraft, will probably be extra amused.
It’s extremely dark. If you’re not in a good place mentally, avoid.
Family and party members kill each other, frequently. So read between the lines about the “pets” and animals, and that provides the dark context.