Project X-Pher © 2011 Injoy Motion Corporation.
In 2131, due to impact of extreme climate change humanity has forced to live underground. A century later, scientists creates a new energy element "X-Pher" which gave humanity a new hope of living on the surface of Mother Earth. However a new intelligent life-form occupied Mother Earth, they took over X-Pher. Over 3 years of effort, the Union of Nations and scientists developed several counter-attack weapons in order to retrieve X-Pher. As a result, in 2234, "Project X-Pher" and International Artillery Corps were founded!!
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Official website: http://www.injoymotion.com/Games_PXP/PXP_std_1.html