Xybots was one of our favorites of this period, with a dungeon-like pseudo-3D maze filled with robots to shoot (though it also featured one of Atari's biggest sins of this era, the ever-decreasing player health, because apparently both the space heroes of Xybots and the fantasy squad of Gauntlet had some terrible wasting disease that required constant eating). Nonetheless, it's easy to get into while being challenging in later levels, and it plays great on MAME without a fancy twisty joystick (if you have 3 buttons in a row, just map the center button to Fire and the first and third buttons to rotate). Don't get neutralized!