#15
Red Planet Farming is a Mars colony management game where you plant crops across four distinct regions, shield them from dust storms and radiation, and keep a growing population fed. Entirely free, zero monetization. The survival flavor here comes through resource planning and hazard management rather than any direct survival gameplay—you're not controlling a character, you're managing systems from above. That's why it sits at the bottom of this list. Worth a look if the idea of a quiet, thoughtful Mars strategy game appeals to you and you're not expecting anything close to a survival sandbox.