There's a type of design philosophy that I have been trying to define when it comes to shoot 'em ups. A combination of the feeling of a perfect level of speed, combined with excellent enemy placement and bullet patterns that never slow down, with music complimenting the action that creates an incredible feeling of adrenaline with each and every action the player takes; a "high" that lasts for the entire duration of the game, that never ends, until you hit that credits screen, and you're ready to do it all over again, because it was a meditative experience that comes once in a lifetime.

That is Mushihimesama. My favorite shoot 'em up, and one of the best games ever developed. For the love of Ikeda, play this one.