Orbital Siege: Tower Defense

The invasion fleet has reached your orbit. Drones, cruisers and bombers are closing in on the station core, and only your defenses stand in their way.

Orbital Siege is a sci-fi tower defense game. Build towers on fixed platforms, upgrade them, and hold the line wave after wave across asteroid fields, nebulae and orbital stations.

★ 20 HANDCRAFTED MAPS
Fight across two sectors, each with its own route: spirals, forks, crossroads, a galaxy and a fortress maze. Some maps have up to three entry points, so you have to cover several fronts at once.

★ GROUND AND AIR THREATS
Ground units follow the energy road. Fighters and bombers ignore it and fly their own direct route from the far side of the map. Plan your defenses for both.

★ 7 UNIQUE TOWERS
• Railgun: reliable single-target damage
• Cryo Emitter: slows enemies down
• Flak Launcher: powerful anti-air
• Pulse Laser: continuous beam that melts shields
• EMP Generator: area damage, double damage to shields
• Plasma Mortar: long-range explosive barrage
• Support Node: boosts the damage of nearby towers
Upgrade every tower through 3 levels, or sell it at any moment, even in the middle of a wave.

★ 7 ENEMY TYPES
Scout drones, fast interceptors, armored cruisers, shield bearers, fighters, heavy bombers, and the Carrier boss, which releases drones as it takes damage.

★ NO PAUSE, ONLY SPEED
Waves launch automatically. There is no build pause, so every decision counts. Speed things up with x1 / x2 / x3 when you feel confident.

★ STARS AND RESEARCH
Earn up to 3 stars on every map by protecting your base. Spend stars on Research to increase tower damage and range by up to +50%. You can reset research anytime and try a new strategy.

★ BUILT FOR MOBILE
• Smooth 60 FPS on modern phones
• Supports notched screens, tablets and foldables
• Detailed sound settings for music, towers, combat and interface
• Play anywhere, no internet connection required

Can you hold the orbit until the last wave?
Install Orbital Siege and defend the station!

Recent changes:
minor changes