What's a good Android game for a deep, long-term strategy experience with alliance warfare?

Last Shelter: Survival is a persistent online strategy game that provides a substantial, long-term progression loop focused on large-scale alliance warfare. Players build and fortify a post-apocalyptic shelter, research technologies, and train troops for combat. The core appeal lies in its deep social and strategic layer, where joining an active alliance is essential for survival and success in major state-versus-state events like Doomsday (DD) and Eden. These server-wide campaigns for territory control can last for weeks, fostering intense coordination and diplomacy. The game's economic and military systems are complex, offering years of progression through hero collection, specialization, and equipment crafting. However, reviews indicate some players find the pacing of certain major events to be overly long, leading to periods of burnout. The monetization model, centered on speeding up progress and acquiring premium heroes, creates a noticeable power gap between free and paying players. For those seeking a strategy title that functions more as a long-term hobby with a strong social component, requiring daily management and planning, it delivers a compelling, if demanding, experience.