Monsters occupied your base on a distant planet. This building is designed to collect very rare materials that are not on your hero's home planet. Its task is to protect the base at all costs and gather all the resources. To protect buildings, you are allocated a certain amount of money, which must be invested in the construction of security towers. Properly installed, they will protect the adjacent territory from alien invaders, who will try to destroy the crowd. With each new wave, there will be more of them, so do not forget to improve your buildings to keep the monsters as long as possible in the game A Ultima Esperanca.