R4 (Rocketman) 3.1

R4 (Rocketman) is the sequel to the popular and highly rated 90's retro Amiga game R3 (The Art of Rocketry) by Bruce Webster.
The goal of the game is to fly around 2D cave levels, pick up cargo and destroy enemy units.
An intergalactic alliance known as The Nice People of the Universe have contracted you (an space ship pilot freshly graduated from Space School) to defeat the so-called Evil Zippy Empire.
To complete each level, you will need to destroy all of the enemy gun installations and space ships and you will also need to locate all of the precious cargo and return it to your Home Base.