Defend your base by placing and upgrading towers to destroy incoming enemies. Choose from various maps and difficulty levels. Use special powers and customize strategies to defeat waves of space invaders.
Build and upgrade a to defend against enemies. Manage resources to strengthen defenses. Make strategic decisions to overcome challenges. Complete levels to progress through the story. Unlock new units and abilities.
The app requires users to build defense units to block air and river enemies. Destroying enemies provides gold to build and upgrade defense units for increased damage.
