Supreme Commander -

Maps range from modest 5km squares to a staggering 81km across, providing room for maneuvering rather than just fighting over single chokepoints.

You manage a constant flow of resources. Building a unit drains Mass and Energy per second; if your consumption exceeds your income, every construction project on the map slows down proportionally. Supreme Commander

The "Experimental" tier features game-changing monstrosities like the Cybran Monkeylord (a giant laser-firing spider) and the UEF Fatboy (a mobile fortress with battleship cannons). Economic Innovation Maps range from modest 5km squares to a