Another free to keep game from GOG.
Pandemia System: A futuristic world where law and order have been replaced by a tidal wave of terror and crime. The human federation decides to frame one of it's best men for treason and disobeying orders and sentences him to spend the rest of his days on one of the planet's prison cities. This is his cover as he begins the most crucial mission of his life..
Steam link: https://store.steampowered.com/app/1112570/Crime_Cities/