PixlBit | "If there was one thing that Techno Soft did very well in the 16-bits days, it was shoot ‘em ups. It all started when they created Thunder Force in 1984. It was released on the NEC PC-8801 and several other Japanese home computers at the time, but never saw the light of day in the US. The game featured an overhead free-roaming viewpoint and the goal was to destroy the enemy’s shield generators, using your main shot for air targets and the bomb shot for ground targets in each stage. While it’s tough to gauge the game’s popularity from back then, it apparently did well enough to warrant a sequel. So Thunder Force II was released four years later for the Sega Genesis in 1989, making it the very first shoot ‘em up on the system."