Click on the screen to place your turret in the desired location. Combine two identical turrets to enhance their power and access new abilities. Target your turrets towards the incoming hostile forces to defend the galaxy. Deploy special powers by pressing their icons when they are fully charged. Move through multiple levels, each with specific challenges and enemy patterns. Strategize about turret placement and merging to optimize your defense against tougher waves. Complete levels to collect stars and open new zones of the galaxy. Be aware of special enemy types that require unique strategies to defeat.