ArugulaZ
Fearful asymmetry
The guest ships in Dariusburst kind of blow my mind. There's like a dozen of them, including characters that from all appearances would be wildly incongruent with the Darius style of gameplay. Yet somehow they made Opa-Opa and the ship from Dodonpachi work within the framework of an entirely different game. I guess the relative banality of Darius's design makes that possible... you can pop all kinds of ships with all different kinds of play mechanics in there, and the game is open to it because there's no central "hook" in Darius that runs contrary to the way any of those other games play.