Force Field is original arcade game from the T&D disk/tape magnazine (Issue 19 from January 1984 in particular). In it, you control the ship on the bottom of the screen, below the force field that the aliens are attacking. You have to shoot them (you can only have one fireball on the screen at a time), and you also have to recharge your own fuel by shooting the fuel cells at the top of the screen.
Title: Force Field
Author: A. Pakerski
Publisher: T&D Software, Issue #19, January 1984
Released: Late 1983
Requires: Color Computer 1/2/3, 16K RAM, disk or cassette.