Universe at War: Earth Assault (Steam)

Save the world or destroy it as you take charge of several unique factions with awesome powers and spectacular units. Control massive-scale alien war machines that are fully customizable. With on-the-fly tactical customization, you can dynamically swap out weaponry, rework your tech tree, and retrain units in the middle of combat to thwart your foe and seize the advantage. This advance on the traditional rock-paper-scissors model of balance gives players even more control over how they respond and adapt to their opponent's strategies.