Abadox

Abadox (アバドックス, Abadox^?) is a video game for the NES, subtitled The Deadly Inner War. In it, the player (as "Second Lieutenant Nazal") battles an alien organism named Parasitis that engulfed and digested the entire planet "Abadox", and assumed its shape. He must fly into the alien's body in an attempt to rescue the swallowed Princess Maria.

Gameplay

The gameplay largely follows the conventions of side-scrolling shooters of the time. The player shoots enemies, takes one hit to get killed and acquires power-ups, such as more powerful weapons and speed power-ups.

The game alternates between vertical and horizontal scrolling levels. The vertically scrolling levels have an unusual twist; instead of scrolling up on the screen, the levels play out in a downward manner with the player character facing down.

Hozizontal-scrolling gameplay

Vertical-scrolling gameplay

Abadox is a futuristic space shooter that uses both side-view and top-down perspectives. As the last remaining captain of the fleet, your goal is to fly into a monster and destroy it from the inside. Hindering your task are captured spaceships, parasitic worms, and even cells from the monster's immune system. The boss you encounter in the first level is a semi-digested dog, which conveys a certain amount of revulsion not easily achievable on the system.
Gameplay:
You'll have to shoot your way through the bowels of the monster with everything you have and more. You can find defender blocks that will help you avoid some attacks, and be thankful for that, because one hit, and you're finished in this game. You can also find upgrades for your gun, which you'll desperately need as well.International release dates:
Japan: Dec 15, 89