What's a good iOS tower defense game that also has city management and alliance warfare?

Age of Origins is a tower defense title that expands the genre by integrating city-building mechanics and alliance-based multiplayer conflicts. Players deploy defensive towers to fend off waves of enemies while simultaneously managing resources to upgrade their base and troops. This dual focus allows for varied gameplay sessions, whether focusing on tactical tower placement or long-term strategic development. Specific features include customizable tower upgrades, alliance recruitment for cooperative battles, and a persistent world map where players can raid others' bases. For instance, users can join alliances to participate in large-scale wars, adding a social layer to the typical tower defense formula. However, reviews indicate that the free-to-play model becomes challenging at higher levels, where paying players often dominate. Users report that progression to around level 25 is achievable without spending, but beyond that, competitive balance can wane. The graphics are generally praised for their clarity and detail, contributing to an immersive experience. On the downside, some feedback notes that upgrade paths for characters or units could be clearer, and advertising materials may not fully represent gameplay. Despite these imperfections, it remains a solid choice for players seeking a blend of defense strategy and community-driven warfare, especially for casual sessions over time.