Survive 21 Days invites you to a mysterious cosmic world where you lead adorable cat miners, collect valuable energy minerals, upgrade powerful equipment and tools, and resist alien invasions. Launch rockets, explore unknown planets, and send out your cat miners to dig for gold and crystals. Defend against greedy alien invasions by upgrading various equipment, from static fields to radiation, arming your spaceship to the teeth. Harvest harvested crystals to recruit more cat miners and upgrade your rocket. With a steady output of minerals and energy, gain more powerful abilities.

Featuring cute cartoonish space adventure visuals, an entertaining casual tower defense gameplay process, and the challenge of setting longer survival records. Join us now to embark on your adventure, create your mining kingdom in a tower defense game, and experience endless imagination!