Otocky is a game where you control a flying creature that must collect musical notes in eleven horizontal scrolling stages. Your creature is equipped with a ball that can be fired in eight different directions, creating unique sounds as it moves through the levels. The ball can also shoot enemies that get in its way, and your creature has a limited projectile attack to use when things get too tough.
The goal of each stage is to collect musical notes until a meter fills up with five note icons. As you fill this meter, the stages become progressively harder as enemy combatants take over the spots where notes were collected. When the meter is full, your ship will warp to the stage boss, a large musical note.