Armalyte is one of the best shooters ever created for the Commodore 64. This horizontally scrolling sci-fi shoot 'em up was developed by Cyberdyne Systems and published by Thalamus in 1988.
Vietnam 3275 is a sci-fi shoot 'em up developed by Stavros Fasoulas for the Commodore 64. It's a modified version of another game released in 1987, called Delta MK II (or Delta Patrol).
Armalyte: The Final Run is the enhanced version for 16-bit platforms of the Shoot 'Em Up created by Cyberdyne Systems/Thalamus in 1988 for the C64. The Final Run was published in 1991 for the Amiga and Atari ST.