Galaxy Defense

Galaxy Defense is a tower defense game with a sci-fi theme. In each level, the player must set up defense towers in pre-determined locations in order to defend his base against incoming waves of droids. There is a number of different kinds of towers, each with different strengths and weaknesses. The towers can be attacked and destroyed by the droids.

Destroying droids yields alloy which can be spent to buy or repair towers, or upgrade them to more powerful versions. The player can deploy several special weapons, e.g. an EMP which paralyzes droids, but each special weapon costs energy which is replenished slowly over time. After finishing a level, the player receives coins and diamonds, which can be spent between levels to buy various upgrades (e.g. more health for buildings, more maximum energy, etc.)

The player can purchase additional coins and diamonds for real money, or earn them by performing simple tasks (such as downloading and running a specific app, or watching a game trailer).