Nemesis

Nemesis is a vertical scrolling shooter where the player controls a small spacecraft and must shoot incoming asteroids and spacecraft. It takes place in the far future of 2654 where a region of space called the Gamma Sector is under assault by an evil Nemesis Robot and its Dragon Force. The game features a variety of weapons including a laser, plasma cannon, proximity bomb, and missiles. Powerups include weapon upgrades and deflector shields. In total there are nine stages to complete.

This game is unrelated to the Gradius series, which also goes by the name Nemesis in some markets.