Tap the void to spark Stardust. Buy generators to grow your universe automatically. Watch the sky: comets can smash straight into your generators and destroy them, aliens shoot at your fleet from a distance, and tougher enemies take more than one hit. Power-ups are worth grabbing fast. Every so often a Mothership boss shows up, kill it in time or it wrecks your fleet. Buy defense upgrades to fight back. When you're big enough, collapse the universe for a permanent boost and start again.