What's a good Android game for merging units to create a powerful defense?

Kingdom Guard: Tower Defense offers a fresh take on the tower defense genre by incorporating a merging mechanic. Instead of simply placing towers, you merge identical units to create stronger, more capable defenders. This adds a layer of strategy as you decide when and what to merge, optimizing your defense against increasingly challenging waves of enemies. The game features a variety of heroes and unit types, each with unique abilities, allowing for diverse strategies. As you progress, you'll unlock new units and upgrades, continually enhancing your defensive capabilities. The engaging gameplay loop and satisfying progression system make Kingdom Guard: Tower Defense a compelling choice for fans of tower defense and merging games alike. The game also features idle rewards, ensuring you're always making progress, even when you're not actively playing. With its blend of strategy, merging, and tower defense, Kingdom Guard provides hours of engaging gameplay.