This is a good strategy game, with simplified concepts, but able to prove quite a challenge. In order to reach the targets on each map, you must expand your control area using passive buildings which transfer energy from your main base. At the same time, you must protect your buildings from the ever-expanding enemy control area, by building weapon systems. You must come up with a strategy that enables you to expand bit by bit, by focusing weapon systems to clear a small enemy area and then claiming it for yourself. You cannot effectively sustain too many weapons systems, so you must change their locations to best keep the enemy under fire. While this provides an engaging experience, you will come to miss a proper save option (you can only save between missions), while sometimes you'll want the possibility to adjust game speed. To sum up, a good strategy game that can keep you engaged for a long time.