Avolora: Crystal Keep

Instead of placing stronger towers directly, you start with basic units and evolve them by combining duplicates into higher-tier defenses.
Each merge transforms your battlefield different designs, higher stats, and unique effects appear as you progress. The challenge is not only surviving waves but also managing how and when you upgrade.
Space is limited, choices matter, and every merge can shift the outcome of the battle. Build efficiently, react to pressure, and scale your defense into a powerful layered system.