Cosmic Mart is a 2D top-down action roguelike and twin-stick shooter that immerses players in an alien-infested supermarket. The game features procedurally generated levels, ensuring that each playthrough offers unique challenges with randomized rooms filled with hazards. Players must navigate these lethal environments while dodging enemy fire to survive. The primary objective is to clear enemies across six perilous floors as part of a mercenary contract. As players progress, they can collect and build powerful item combinations that enhance their firepower and passive abilities, adding depth to the gameplay.

The game introduces a mercenary system where players can swap between different characters upon death, each with unique traits and playstyles. This mechanic encourages experimentation and adaptation, mirroring the themes of resilience and exploration found in cosmic ventures. By embracing procedural generation and the iterative nature of gameplay, Cosmic Mart provides a captivating experience that challenges players to grow and adapt as they face the unknown.