Module TD. Sci-fi tower defense

In Module TD: Sci-fi Tower Defense, you must defend your planet from invasion! Place laser weapons, Gauss guns, and other defensive towers at strategic points on the map to create an invincible defense line. Destroy enemies to earn rewards, and conduct research to discover new sources of energy, materials, weapons, and ammunition. Upgrade your towers and rebuild levels for an even more challenging experience. Enjoy the handy system of controls and fantastic upgrades as you play through the exciting levels.