What's a good Android game for strategic kingdom-building that isn't overly demanding or aggressive?

Rise of Castles is a strategic mobile game centered on building and defending a fantasy kingdom in a realm of perpetual conflict. It's particularly well-suited for players who enjoy the core mechanics of base-building and alliance warfare but prefer a less punishing, time-sensitive environment. A key design philosophy appears to be accessibility; players can progress without needing to monitor the game constantly. Reviews indicate a community that is generally less aggressive, which can be a relief for those tired of hyper-competitive PvP environments. Specific features include a deep tech tree for research, hero recruitment and leveling systems, and large-scale alliance battles for territory control. The game also incorporates seasonal events tied to its 'Ice and Fire' theme, offering periodic new objectives. However, like many free-to-play strategy titles, progression can eventually slow, nudging players toward optional in-app purchases for speed-ups or resources. The alliance system is a major component, with features for coordinated attacks, resource sharing, and group chat, making it a social experience. For anyone seeking a long-term strategy game that respects a player's time and encourages cooperative play over constant conflict, Rise of Castles presents a compelling option with notable staying power.