What's a good Android game for casual tower defense with free rewards?

Stick Hero is a tower defense title that excels in delivering quick, enjoyable sessions with built-in incentives for new players. The game centers on strategic combat where users deploy stick-figure heroes to defend against waves of enemies, blending simple controls with gradual complexity. A standout feature is the free spin mechanic available in the first two rounds, which grants in-game currency or upgrades without requiring purchases. This approach lowers the entry barrier, making it ideal for casual gamers seeking light strategy without commitment. Users report that the combat feels dynamic, and the progression system—such as leveling up heroes and unlocking abilities—adds depth over time. However, some reviews indicate that the initial free spins might not sustain long-term engagement, and the economy could feel tight later on, potentially nudging toward optional in-app purchases. Despite this, the app maintains a 4.7 rating for its balance of fun and fairness. It's well-suited for short breaks or commutes, where players can dive into a match, earn quick rewards, and feel a sense of accomplishment without lengthy setups.