Play Thunderbolt Ii Online

Thunderbolt II was a Sega Genesis release, though I don't recall the developer offhand. It came out during that period when the Genesis library was expanding with various action titles, and this one fit right in with its straightforward sci-fi premise.

You pilot a lone starfighter through horizontally scrolling stages filled with enemy ships and installations. Your main goal is to survive the gauntlet, destroying everything in your path to reach the end-level boss. The ship has a primary forward shot, but you can collect power-ups to change your weapon; I remember a spread shot and a laser being particularly useful. The screen scrolls automatically, forcing you to keep moving and react quickly to the waves of enemies and their patterned attacks. The difficulty is consistent, demanding sharp reflexes to navigate the dense enemy formations and occasional environmental hazards. It feels like a tense, focused battle against overwhelming numbers.