The Lost Planet TD is a tower defense game where your goal is to defend your base from alien attacks. You were traveling in outer space to explore new and exciting places. But your spaceship malfunctioned and you crash landed on a remote alien planet with dangerous aliens that want to eat you. Build various tower between you and the alien to protect yourself. Each tower you build can be upgraded to improve range and damage. Collect batteries as you progress that can be used to unlock new regions and upgrade your tower.