Radial Fusion is a 2D retro-style arcade shooter that challenges players to defend the solar system against a variety of enemy threats. Set in a vibrant space environment, players navigate their ship to destroy descending enemy fusion weapons while avoiding explosive mines. The game features six progressively difficult levels, each introducing new enemies and challenges, alongside a bonus level that allows players to test their skills against rapidly charging enemy ships. Players can scale the game screen for an optimized experience, ensuring a comfortable gameplay environment.

The gameplay mechanics are straightforward yet engaging, with controls that allow players to speed up, slow down, and aim their ship effectively. Players must strategically manage their ship's position and weapon usage to avoid damage while countering enemy attacks. The game's scoring system tracks player performance, including high scores and the number of ships lost, enhancing replayability. With intuitive controls and escalating difficulty, Radial Fusion offers an entertaining challenge for fans of action games.