I finally found this tune! I believe the game didn't have a link to begin with... or I'm just blind. Anyhoo...
Must say, this is a wonderful tune. I can listen (and have listened) to this for hours on end from the menu screen of the game, while writing and painting. It's so melancholic and sort of dreamy, while still having that heavy post-apocalyptic feel. While I completely adore WILT for all it's quality it's this tune I keep coming back to. Brilliant song and great inspiration!
The Audio section of Newgrounds is really underrated - you wonderful minds have so much great stuff going on here!