What's a good Android game for merging units to defend a fortress with puzzle elements?

Fortress Merge: Puzzle Defense offers a compelling blend of merging, strategy, and puzzle elements. You'll strategically merge units to create stronger defenders and bolster your fortress against waves of enemies. The puzzle aspect adds another layer of depth, requiring you to think critically about unit placement and resource management to maximize your defenses. The game is developed by TapNation and has a rating of 4.2/5, suggesting a positive player experience. If you enjoy games that challenge your tactical thinking while providing satisfying progression, Fortress Merge: Puzzle Defense is definitely worth checking out. It's a fun and engaging way to test your strategic skills and build an impenetrable fortress. The combination of merging and puzzle elements provides a refreshing twist on the traditional tower defense genre, keeping gameplay interesting and rewarding.