Planetary Orbital Defense

Planetary Orbital Defense is great online alien game. Defend your city from being obliterated off the face of the planet. Control Towers are the most important buildings inside your city, and they're the most targeted. Agri-Domes are vital buildings for your city's meals and oxygen supply. Power plants produce the energy required by you Gun Base, so defend them at all expenses. Bonus points might be awarded in each and every level. Excellent luck and take pleasure in!