Last Oasis is a unique take on the survival simulator genre, boasting a MMO-sized world and walking mobile basis fit to escape the scorching sun.
From the Steam page:
WalkersTraverse the world on wooden wind-powered, walking machines inspired by Theo Jansen's amazing strandbeests. Walkers can be adapted for travel, transportation, harvesting, combat, or used as mobile bases. A multitude of structures, attachments, and upgrades allow players to personalize Walkers to their needs.
The Scorching SunThe Sun burns the land in the west, turning it to dust. In order to stay ahead of the obliterating Sun, nomads must explore new territories that slowly emerge on the eastern horizon, from the side of the Earth that has long been frozen in impenetrable ice.
Survive and ThriveFind ways to survive. Gather resources. Craft equipment. Build your Walker. Improve your skills. Learn to exploit what remains of the world. Keep your Nomad alive for as long as you can, as you become stronger the longer you escape death.
Trade in a Player Driven EconomyTrade networks stretch between the known oases. The global player-driven economy is based on real supply and demand. Smart and quick traders can make huge profits, but running trade routes always comes with a risk. Other nomads may opt to produce or hunt down rare and highly localized resources. It’s always wise to consider potential competitors first though. Challenge another clan’s monopoly, and you may become their next target.
Travel and Explore an MMO-sized WorldThe world consists of many interconnected oases, forming a large open world. Potentially a thousand oases exist simultaneously - the number automatically adjusts to accommodate the size of the player base. Each Oasis is over 100 km2. Explore them to reveal new and unique biomes while plundering their limited resources. Some nomads may pitstop to refill their water. Others will settle for some time, but ultimately everyone will pick up and voyage east to escape the encroaching Sun.