The most aggravating visual aspect in PQ is the camera. You can use the shoulder buttons to rotate the camera around to the opposite direction, which is needed when you're moving around in 3D maze-like environments. Unfortunately, there's very little control; you can't, for example, stop the camera at 90 degrees... it is going to continue to swoop around to 180 degrees or (if you let go), return to the original camera angle. This doesn't present a problem all the time, but when it does, it's more than a mild aggravation.
The character that you play as is a white guy. Not Caucasian, mind you, but a guy that seems to be made of white light. There is no detail to the model -- no textures used at all, it seems. Just whiteness. Yet, it serves just fine to indicate what direction you are facing and where you are and, as such, does what it's supposed to.
The sound effects are lackluster and somewhat iconic themselves, but the music's not bad; the type of music that sort of sits in the background and lets you do your thing - which is good, considering the level of concentration you'll want to put to solving these problems.