Fun, but...
It after you get jets, ships, Lazers, and mini-nukes, the computer becomes pitiful. The same strategy works every time. Step 1: Send out Gunmen to capture all the positions on the map. Step 2: Queue up two ships and three jets. Step 3: Use lazers and mini-nukes to keep the enemy from reaching any positions. Step 4: Nothing, you've already won. This works even on the hardest difficulty. If you beefed up the AI and toned down fortress weapons, and you could have a winner here. As it stands though, not bad, but not too good either.