This game is made by the authors of x-plane. Its sort of like a Mech Warrior title but with alot more detailed gameplay. Here is a clip from the storyline.
Eight months ago, our outposts at Proxima-4 were destroyed by small nuclear weapons launched by a then-unknown enemy. Many survived the initial attack due to the low radiation levels and lower destructive levels of the smaller nuclear weapons (resembling our current terraforming nukes) that were used. Most survivors were quickly mopped up, however, by the invader's clean-up force... a horde of walking mechanical terrors that raged through the cities, destroying every vehichle and every person that survived the initial onslaught... the few survivors that managed to escape the attack have described two-legged walking machines that tower over 20 meters above them, armed with weapons that were clearly designed to destroy anything and anyone left alive after the initial attack. We have since learned that the tactical nukes were actually launched by the marching behemoths from a few kilometers outside the city, creating an initial destruction that it made it easy for them to clean up the survivors.
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