Unstoppable Gorg is a different sort of Tower Defense game. Though it contains all of the elements usually associated with the genre - towers, enemies and limited resources - it also adds the additional challenge of limiting where you can place your defenses. While it may sound like a hindrance, the limitation is oddly liberating.
Levels are designed around orbiting satellites. Each round, a mothership will launch a series of enemies, which follow a particular path towards the "base" at the center of the orbiting defenses. Unlike other Tower Defense games, the paths the ships take will vary, requiring you to rotate and adjust your orbital defenses to match the incoming invaders.
It's a novel idea and, after a steep learning curve, adds a really cool puzzle element to an otherwise static play mechanic. Although at its core, Unstoppable Gorg is still a Tower Defense game, shifting defenses in orbit adds a frantic puzzle mechanic. There's rarely a moment where you can sit back and just watch as things happen. You have to keep your attention locked not just on what is already working its way through the pipeline, but also look ahead to what is coming next and where it is coming from.
Campaign is joined by Arcade and Challenge Modes. Arcade is all about survival. Ships keep coming and you need to see how long you can survive. With Challenge, you replay Campaign missions, but with addition restrictions. Both are fun, but only if you like the core gameplay. It's a nice change of pace, but introduces a few new difficulty problems.
