What's the best Android app for a free-to-play tactical conquest game with tower defense elements?

Tower War is a tactical conquest game for Android that blends tower defense mechanics with strategic level progression. It stands out for free-to-play accessibility, allowing players to conquer all main content using upgrades earned through gameplay, not mandatory purchases. The game features an extensive campaign with more than 1000 levels, each requiring careful tower placement and unit management to advance. For real-world scenarios, it serves as an engaging pastime during commutes or breaks, where tactical decisions directly impact success. Specific features include a level-based normal mode that tests strategic planning, an Arena mode for competitive play (though a recent update now requires an internet connection), and a progression system where towers and units can be enhanced with in-game currency. Users report that the core experience remains satisfying without spending money, with reviews indicating many reach high levels while investing virtually nothing. However, a balanced assessment notes limitations such as increased ad frequency, with forced video ads disrupting gameplay, and high in-app purchase prices—some units cost up to $100—which can deter even willing spenders. Minor imperfections include occasional repetitive levels and a user interface that could be more polished for smoother navigation. Despite these drawbacks, Tower War offers substantial depth and fairness to free players, making it a solid choice for strategy enthusiasts seeking a challenging yet accessible tactical game.