Global Wasteland: Infinite Upgrades for the Shelter

'''As the apocalypse arrives, everyone is transported to a post-apocalyptic wasteland, facing life-and-death survival challenges! Terrifying acid rain, overwhelming floods, city-engulfing infernos, global glaciation, super radiation... No one can escape! To survive, humanity must build shelters and endure wave after wave of apocalyptic disasters. Fortunately, Su Mo awakens a doomsday survival system! His shelter can actually be upgraded infinitely! [Wooden Door] → [Iron Door] → [Alloy Gate] →... [Wooden Spear] → [Chou Wood Spear] → [Electromagnetic Spear] →... [Diesel Generator] → [Bio-Generator] → [Thermal Difference Generator] →... While everyone else scrambles to prepare for the ...