In Cosmic Invaders, players take control of a spaceship tasked with defending the galaxy from waves of alien invaders. The objective is to shoot down as many aliens as possible while avoiding enemy fire and rescuing captured spacecraft. As players progress, the game becomes increasingly challenging, with faster and more aggressive enemies. Players earn $COSMIC Tokens for each alien defeated and for rescuing allies. These tokens can be used to purchase extra lives and power-ups, providing players with strategic advantages during gameplay.