In Space Invaders 90, you play as a space adventurer who must navigate your way through an alien planet in order to save the human race. The game is based on the classic arcade game of the same name, and features a unique control system that allows you to move your ship around the screen using a joystick. You can also use your ship's cannons to destroy the enemy ships, and use your spaceship's engine to fly up into the sky and battle other space adventurers. If you survive the challenges of Space Invaders 90, you'll be rewarded with a share of the treasure that the aliens have hidden on the planet.