Post-apocalyptic worlds in video games don't necessarily have to be grimdark, depressing or colorless. There are many fine examples where the game's design either moves beyond these tropes, or develops them to perfection. We have collected a few of them below.
source: veteran0121's let's play of the game
source: Half-Life Wiki
source: NormanJayden's let's play
source: 50CALBR's gameplay video
source: The S.T.A.L.K.E.R. Wiki
source: official trailer
Make sure to submit your own picks in the comments! With visual support.