Paratrooper is a 1982 fixed shooter written by Greg Kuperberg and published by Orion Software as a self-booting disk for IBM PC compatibles.
It is based on a 1981 Apple II game called Sabotage developed by Mark Allen.
Firing a shell costs the player one point, so if one is playing for score, there is an incentive to conserve ammo.
The game's intro music is an interpretation of a brief section of Johann Sebastian Bach's Toccata and Fugue in D minor, BWV 565, played through the PC speaker.
The magazine described it as "a well-executed but unexceptional game [which] quickly loses its appeal after a dozen or so plays".