Kid Icarus and Metroid for NES share several similarities. For one, they feature remarkably similar gameplay, though Kid Icarus is a bit more linear. More importantly, they both utilize the same game engine and were released on the same day in America, and a big selling point for both titles was its use of passwords. Although its called "Sacred Words" in Kid Icarus, the password system is identical in both games, though you can't recruit Justin Bailey in your quest to save Angel Land.
Kid Icarus even features Metroids as enemies in Level 3, the Skyworld, although they do not behave the same as they do in Metroid. Some screenshots recently released at E3 2011 reveal that these Metroid-like enemies, called "Komayto", will return to fight again in the upcoming Kid Icarus: Uprising.