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Historically the cheapest price it has ever been since release, I believe. Tempted myself to order a copy.
As natural resources dwindle and gargantuan monsters begin to attack civilisation, mankind retreats behind the walls of their city strongholds, bolstering defenses and developing new weapons to repel the constant attacks. As commander, you must take command of your rookie crew, and defend the city against the monster threat. Using an innovative rotational district mechanic, you are able to change the arrangement of the city to best prepare for the counterattack. Command the last bastion of humanity in the fight for survival!
-A dynamic city-rotation mechanic revolutionizes the strategy genre
-Train and level up your squad, your city, and your units to hone your skills against increasingly difficult enemy waves
-Experience an immersive 15 hour campaign featuring 30 exhilarating missions