Fixed some additional audio bugs. If you notice any oddness with the volume sliders, do post a comment. Even if the sound doesn't sound right when you set it, in game it should be at the right level. There is a delay between the sound being set and it actually being applied. A delay has been added in the menu to compensate for that. 

New item: Energy shield. Grab the energy shield pick-up and you'll find yourself protected for 30 seconds from all damage. The volume will be adjusted on this in the next version. It's a little louder than intended. A timer will also be added to make it more clear when the shield has expired, but for now it fades out.