This game is often compared to Super Metroid, and while the influence is obvious I think it deserves to be viewed as it's own work with how many ideas it brought into the metroidvania genre. The greater world design and item progression are key elements of that formula, and while SotN is pretty uneven in both areas, it greatly enhances the smaller scale experience with a plethora of weapons, items, and minor upgrades all throughout the game.

The titular castle is now more than set dressing for an action platformer, and features locations you both expect to and would be suprised to see in such a grand structure. And while action combat is fairly easy (especially for the series), the feel is incredibly strong and enemies are extremely varied and fun to fight. Visuals and music are of course some of the best imaginable, and the campy voice acting is iconic from the well known opening scene to hidden encounters many players never find.