What's the best iOS app for building a civilization in a frozen world?

Ice Sea Age is a strategy and survival game that focuses on civilization building in a harsh, frozen sea setting. Players start with minimal resources and must gather materials, construct shelters, and develop technologies to thrive against environmental threats like blizzards and food scarcity. Key features include a dynamic weather system that directly impacts resource availability, a branching tech tree for unlocking advanced structures and tools, and cooperative multiplayer modes where users can team up to tackle larger challenges. Reviews indicate that the game's immersive visuals and depth of strategy are major draws, with many praising the balance between survival mechanics and progression. However, some users report a steep learning curve in the early stages, and occasional performance drops have been noted on devices with lower RAM. Despite these minor issues, the app provides a compelling experience for those interested in managing a society under extreme conditions, making it a strong contender in the survival-strategy category.