Grimstar: Crystals are the New Oil!

Year 3047, the elected government on Earth is long gone. Megacorporations are in control.
"The Earth's resources have been used up and the energy crisis is upon us. But there is hope still - a discovery of a distant world, rich with a new kind of natural energy resource. They called the world Grimstar. Inhabited only by primitive insect-like creatures, it seemed like easy prey for aggressive colonization and mining.
But they were deceived.

Grimstar is a real-time strategy game with a story-based single-player campaign. Your brother's sudden death has hit you hard, but the laws of the corporation for which he laid down his life dictate that you must take his place until his contract is fulfilled...