Defender

Defender is a 1980 Sci-Fi shooter game, where players defend a planet from invading aliens while protecting astronauts. Drawing inspiration from Space Invaders and Asteroids, it's known for its difficulty and is frequently listed as one of the most influential video games, with praise for its audio-visuals and gameplay. With over 55,000 units sold, it was a commercial success and was later ported to numerous platforms.