Best survival game??

You will have plenty of people that will praise valheim but it's kind of a low in Survival game. if you want something that will crush you into the ground with no mercy CDDA [cataclysm dark days ahead] should do the trick use [some dead guy Undead people tileset] because it is an ASCII game and use remyroy/CDDA-Game-Launcher on GitHub to get it. its a free game and the launcher let you update and manage your backups. There is easily hundred hours of gameplay this is not even including the mods. The controls are very complicated for beginners it's just about memorizing the buttons much like Dwarf Fortress but not as many drop-down menus so I would watch gameplay and guides on the controls and tips