Create lines to defend against enemy lines. Protect your base until it has grown to its target radius. Collect coins to purchase upgrades. Collect powerups to gain benefits: Slow Enemies, Unlimited Power, Base Generation Boost, Coin Scatter Click and drag to create defensive lines, which is limited by your available power. Press the spacebar to pause. The lower the better. Beat the levels faster, create fewer lines, create shorter lines, and take less damage to get a better score.