Catonaout is an action platformer game about a little astronaut kitty cat who lands her broken ship on a strange alien planet. At first, the planet looks empty but soon she'll discover it's been inhabited by green hostile creatures who wear space suites and shoot out from laser guns. The cat is unarmed so all she can do is to dodge bullets and watch out for deep pits in the ground. If she falls into one, the game restarts to the checkpoint. Other than that, the planet is full of dangerous crawling and slime organism, which if touched or stepped onto, reduce the cat's health. The goal in the game is to find the repairing equipment needed to fix the ship.