goto is a minimalistic maze game which leads you to finish each level by moving in 4 directions, avoiding obstacles and clearing the path. goto

You are a brave space trooper. Your mission is to clean an alien sector with a huge amount of enemies. Speaking shortly, you have to kill some aliens and return alive. Alien Attack: Pocket Edition

A retro-style arkanoid about fighting aliens to save the mankind.

You are a space trooper. Somehow you got to the enemy territory, and you should wait for your squad to get out of here! But only God knows when will they arrive to you! They will send you bonuses for killed enemies to longer your life till they arrive. [...]

A Space Invaders clone written by John P. Shay and published by Solar Software for the Commodore 16.