Graphically Dark Side of the Moon is a bit of a contradiction. The video segments when talking to a character are excellent. On the other hand the Video Reality segments are a bit too blurry for my taste, probably to improve game performance and reduce the sizes of the video since Luna Crysta is pretty big. While it is nice, in theory at least, to be able to rotate 360 degrees from any point in the game, the end result is a bit of a letdown at times. It's also a bit strange, although perfectly in keeping with the plot, that nine times out of ten you are in a tunnel and being able to rotate your view doesn't really contribute all that much to the experience.
Sound effects are generally reasonable, with ambient sounds throughout the game.
As you approach certain locations the sound will rise in volume, and fall as you go by. I thought this did help contribute to the feeling that you were exploring a real installation. And like a movie or television show, something this game is more like than many adventure games, the musical score is used to build the mood and highlight key points in the game. I thought it fit in well, never drawing too much attention to itself, but adding just the right touch when needed. Voice and video acting for most characters was quite good, certainly better than the norm in a game like this.