Dwarf Fortress - Dwarf Fortress is a single-player fantasy game with two modes: fortress and adventure.
Rust Game - Rust’s world is harsh. The environment is not kind. Bears and wolves will chase and kill you. Falling from a height will kill you. Being exposed to radiation for an extended period will kill you. Starving will kill you. Being cold will kill you.
RimWorld - RimWorld - A sci-fi colony sim driven by an intelligent AI storyteller.
DayZ - DayZ is an open world multiplayer survival game that tosses you in the midst of a zombie apocalypse.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Wild Terra Online - Wild Terra Online is a Massively Multiplayer Online Role-playing Life-Simulation by Juvty Worlds Ltd.