Warlords: Call to Arms
Choose your race and command your army through 25 epic battles to conquer the land. Upgrade and buy extra unit types for your army between levels. Upwards of 50 animated soldiers can be fighting on screen at once!
Simple but expandable concept. Having a world map to conquer is an easy way to add depth to your game.
Play Warlords: Call to Arms, a free online game on Kongregate