For the 'puh' sound, try holding a piece of cloth in front of the mic. If anyone in your family does needlepoint borrow a hoop with cloth in it to hold it tight.Niiice pics.
Seriously, Hunter, the Hyperspace levels have gotten good and original enough that they are practically a separate game in their own right.
As for the voice acting, you didn't answer my question about what kind of quality of recordings you're looking for. The reason I ask is because I am capable of making the recordings now, but the quality of recordings aren't always the greatest (for instance, everytime I make the "puh" sound, it comes out as a burst of sound that is kind of painful for the ears, and volume seems to vary constantly, like the microphone is constantly moving closer and father back when it's not).
If this isn't a problem, then I'd be very interested in at least giving it a shot.