Gemini: Space Tower Defense

Build your last line of defense against an alien invasion. Gemini is a sci-fi tower defense game where placement, weapon combinations, and upgrade choices shape every battle. PLAN YOUR DEFENSE Spend battle gold to deploy towers before each wave. Combine laser fire, freezing shots, flames, sniper rounds, and missiles to hold back advancing enemies. EVOLVE YOUR ARSENAL Use earned score in Tower Lab to improve your towers. Adjust your upgrades and combine different weapons for the threats ahead. Zoom in on the action and choose when to call air support. FACE THE INVASION The full campaign spans nine planetary sectors with distinct terrain, enemy abilities, and powerful bosses. FREE TRIAL AND OPTIONAL PURCHASES Play sectors 1–2 on Normal difficulty free. A separate one-time campaign purchase unlocks access to sectors 3–9, with sequential progression still required. Fel difficulty with the Poison tower and Void difficulty with the Thunder tower are separate one-time purchases; neither includes the campaign expansion or the other difficulty. Complete all nine sectors in Void campaign mode to unlock Endless mode. Buying Void alone does not unlock Endless. The Holy tower unlocks through its free tutorial. Restore purchases from Settings.