Crossfire

The Good
Crossfire starts out as an easy game of reflexes: shoot everything you can in all four directions. The more insects that get released into the grid, the harder it gets. After about five minutes of playing, you're intensly aware that your life hangs by a thread, and the entire world around you disappears as you concentrate on not merely blowing away the bad guys, but staying alive!

The Bad
The keyboard controls allow you to move and fire in all four directions, while the joystick controls, by design, only allow you to fire in the direction you're moving. This is not a problem that is easily solvable, since common joysticks of the time only had two buttons, but they could've used the second button for something.

The Bottom Line
More fun than you would normally think in such a simple game.