Robotrek

A kind of RPG from Enix. Your hero is a young inventor. He must save the planet from the alien invasion. The battle is not for him, but for robots (up to 3 pieces), which must be created with the help of special machines. Gaining experience in battles, the hero gets new opportunities to create components (weapons, shields, bombs) for robots, and the robots themselves become stronger and more resilient. Also levels are gaining and equipment. Interesting single-player game.