Start the Great Wall Watch, the Aliens Kneel Down and Beg Me to Calm Down!

Aliens invaded, the mountains and rivers were shattered, and 1.4 Billion Chinese people were massacred! As the chief architect of the Huaxia dungeon, Zhang Chen obtained the system and returned to the eve of the disaster. I vowed to make the aliens pay with their blood! Are aliens difficult to kill? Create a copy of Great Wall Watch at the beginning! Develop Dongfeng Express to let alien lands bloom everywhere! Build a tank cluster and let the aliens feel the terror of the steel torrent! Complete the aircraft carrier formation and bombard the aliens indiscriminately! You think that's all? Do you want to know about the Nantianmen plan? This is the Chengying tactical mecha, the Xuannv aerial fighter aircraft, the Luanniao aerial aircraft platform... After reading it, do you want to go home and find your mother? But don't leave in a hurry yet! I also have plans for heavenly soldiers and generals! Lingxiao Palace Plan! Nine Heavenly Palace Plan! When human technology becomes a god! The alien race I want to kill will never have peace, and no scrap of armor will be left behind!