ID4 Mission Disk 6: Technical Expert David Levinson

In this ID4 Mission Disk you’ll pilot a alien space fighter craft as it
softens up earth defenses for its mother ship. Using the mouse to move your
craft left and right you will fire upon incoming jet fighters by clicking to
shoot your deadly ray beam.

The goal is to destroy parts of the city beneath you, which can be
accomplished by charging your beam, by holding your click, until it is
powerful enough to take down bits of cityscape. However the incoming pilots,
while easy to destroy, are numerous, high on ammo, and perfectly willing to
use their own fuselages as a weapon against you.