To be honest, I played this game when I was younger.
Till today, this game is still amazing to me with it's unique achievements, great game-play and bosses.
The mechanics of the game is still great today, and the songs used are really nice and pretty suiting.
The background narrator really kind of suits this game as well too (it's hard to explain the feeling of why it does, but most likely most of you guys will agree). And finally, a small touch of humor/comedy or comic-like art-style and writing.