Well let's start with the nitty-gritty; that'll become a pun in just a few lines, so forgive me. From a technical standpoint, the graphics in Nosferatu aren't great, but the developers employed a few clever tricks to make the game look better than it actually is. Basically, since Nosferatu plays like one of those old-fashioned vampire movies, they decided to make it look like an old-fashioned vampire movie. It's not in black or white, but the colors are definitely muted and given a washed out look.
They also applied an interesting touch to the overall presentation of the game. There is an effect to make the graphics look like a really old movie. If you've ever seen a movie that's a few decades old, and hasn't been digitally remastered, you'll know what I mean. The gritty look caused by those little lines and circles that wash around on screen due to the age of the film actually hide a lot of graphical flaws. Have you gotten the pun yet? No? That's a shame...
The music in this game is really hard to remember. It's usually there just to convey the current level of suspense, or to flare up when an evil baddie finally does break out of the floor and attack you. So simply put, the music helps scare the pants off you and any survival-horror game worth it's salt will continually scare the pants off you. The audio is similarly geared for scaring you. However there is a ridiculously annoying sound effect that pops up throughout the game. I'm not sure if it was a bug or something the developer's intended, but it's really irritating, and you'll immediately recognize it if you hear it.