Tap the screen to begin your space mission. Drag your finger or mouse to control your spaceship across the galaxy. Tap to fire at incoming enemies and avoid their attacks. Collect power-ups to boost your ship's weapons and shields. Destroy waves of alien invaders to progress through the game. Be aware of boss battles that require skill to win. Earn points for each enemy destroyed to move up the leaderboard. Discover new ships with different abilities as you progress. Survive as long as possible to reach the highest score.