We are in the Terraforming age after saving our homeworld, Earth, which was collapsed by radioactive contamination and the depletion of resources.
Now, humans are successfully colonizing nearby planets, using technology to adapt these inhospitable and hostile places. For the first time in our existence we feel in harmony with everything.
But our activity and progress has attracted huge and warp monsters that only wish to devastate and sterilize planets by destroying the whole way of life.
We had forgotten, chaos is the natural state of the universe ...

More details on the official game page of Mars: Chaos Menace ...