Time Alien Pig Shooter

You've been given the mission of clearing the planet earthlings just conquer. Aim and kill all the aliens using the fewest possible casualties.
Time Alien Pig Shooter is a cool, futuristic, multi-level, space invaders-style shooting game where you play the role of a defensive spaceship pilot,
and must blast as many enemies as you can in 60 high-intensity levels.
Having been contracted to help in the defense of the vital mining planet moons of Hoy, you must help your company rid the area of alien