I'm a huge fan of Metroidvanias. And this, I suspect, will stand the test of time as one of my most beloved. From the gloriously macabre tone (which the game luxuriates in), gorgeous soundtrack, lush 16-bit visuals, brilliantly-designed world which unfolds around you in unexpected but incredibly satisfying ways, to the perfectly-judge rhythm of the combat and huge, memorable but not irritatingly-difficult bosess - this game has it all. You want this one in your life.