Cosmic Chasm is a challenging shoot'em up where you play as an astronaut trying to destroy the alien planet's power source deep within its underground maze. You can play solo or with a friend taking turns.
The maze is made up of several caverns connected by tunnels, each with its own set of dangers and challenges. Before entering each cavern, you're shown a map to help you navigate the shortest route to the centre. Be careful - there are drones to destroy, traps to avoid, and walls that need to be drilled through first. The further in you go, the faster the drones move, making it harder to survive.
Gameplay is simple: use your thruster to move around, a shield to defend yourself against the incoming drones, and a fire button to blast them out of the way. You'll earn points for destroying the central structure, escaping safely, and drilling through walls.