Pulsar II

Borrowing heavily from the arcade game Scramble, Pulsar 2 is a side scrolling shooter that puts you in charge of infiltrating the 9 levels of an enemy planet named Pulsar.

Your spaceship can fire both guns (horizontal projectiles) and bombs (vertical projectiles) to destroy enemy forces and structures in the air and on the ground. The environment is scrolling from left to right automatically and you'll lose a life if you get hit by enemy fire, an enemy spaceship or collide with the terrain.

The game lets you pick between different difficulty levels or even a training mode.