You are playing as the character that has to defeat boss that after defeats grow in power, but don't worry you will kill him eventually with your lantern power. What kind of lantern power you ask? You can shoot only one projectile from your lantern but when it comes back you can shoot it again. Using dash and objects on map is vise thing to do. One Boss Too Many is an isometric twin-stick shooter, with only one boss that evolves over time.