I don't think I've ever seen the original NES/Famicom hardware put this many objects on the screen at once. And every single one of those objects wants to kill me.
I'm just blown away by the amazing speed of this game and how seamlessly it all runs. Despite the massive number of sprites on the screen at times, and the screenshot above could be considered a lull in the action, Recca almost never slows down or flickers.
This is by far the most intense shooter I've ever played. That said, it is still just a shooter, and apart from the technical accomplishments, adds nothing to the genre that might grab non-fans.