Unstoppable Gorg is a real-time strategy game set in outer space. This game belongs to the tower defense genre, in which players are tasked to defend an area by placing weapons or other structures around it. In this game, players have to defend the solar system from alien invasion by sending satellite towers into orbit. Players can move the towers by rotating planetary orbits. The orbits that surround space stations and planetary satellites such as moons may also be rotated to create the best strategy for defense against each wave of invading aliens.
There are more than 40 levels to finish in this game. Players are tasked to protect different locations in the solar system, such as a floating luxury hotel, the Earth, or a floating asteroid mine. Each location is surrounded by orbital rings; on these rings are areas where players can place satellites. There are various satellites that may be used; each type has a specific purpose. Some satellites have the ability to attack enemies using lasers and rockets, while some are designed to protect other satellites by serving as a shield. Players are given an overview of the types of enemies a level will have so they can decide which types of satellites to use.
Unstoppable Gorg has a 21-mission campaign mode and an arcade mode. Players can unlock challenges that add to the game’s difficulty.