Coryoon is a horizontally-scrolling shoot 'em up where you play as Coryoon the dragon, tasked with saving the princess. The game features several worlds, each with two bosses to destroy at regular intervals, and each level has a loose colour theme.
The game includes various bonus elements, such as fruit released by enemy shots, which can be collected for extra points. Storks also appear regularly, which can be shot to release one of the many bonus weapons, including powerful shots, multi-directional fire, and assisting drones.