Protector Mode features an all new planet flip mechanic and environmental hazards such as volcanic meteors to avoid while fighting off the never ending enemy invasion. (housemarque.com)
UNCOVER THE MYSTERY: Fight through the streets of 1960's America as you uncover the declassified truth behind mankind's first enemy invasion. (2k.com)
In addition to developing new platforms for the base (such as better Combat units to perform dispatch missions, better Intel for reports on enemy / resource locations, better Medical care in case troops get sick, etc.), you now have to worry about enemy invasion, Dark Souls - style. (crunchyroll.com)