20 waves of UFOs close in on your base.

About

Place your turrets, manage your gold, activate your powers at the right time: 20 waves of UFOs close in on your base.

A progression shop lets you reinforce your arsenal between runs, optional contracts add bonus objectives if you want to raise the difficulty, and an "Admiral" prestige awaits veterans who've cleared every wave.
• Turret placement, resource management
• 20 waves, rising difficulty
• Optional contracts, Admiral prestige
• 100% offline · no ads · no in-app purchases