Zero Sum Future Windows game

Zero Sum Future is a game about colony building and ruthless, no-holds-barred economic warfare. You build and manage a space colony, including housing and resources to support a workforce, mining raw materials for refinement into more sophisticated goods, and try to keep up with the demands of your planet's population for various goods like grain, electronics, cargo shuttles, etc. Eventually, you gain the ability to expand beyond your home planet, claiming new planets for yourself or trying to compete with opponents on their home turf if you think you can hang. You also have the ability to construct "illegal" buildings which look perfectly normal to opponents, but are significantly more productive and can really disrupt your opponent's game plan. For example, one illegal building that looks like a hospital actually kills patients treated there and skims their savings directly into your bank account.

You have to be careful about when and how you engage in dirty tactics like this though, because your opponents can investigate you for illegal activity and penalize you if they catch you. It produces a pretty wild, paranoid cat-and-mouse minigame of backstabbing and mindgames.