thank you! great comparison indeed.
it wasn't intended from the start but at one point during the developement i understood that i want it to be a music toy in a way. i think i try to do it with most of my games.
my friends play in a band called Kernherbst. they're making ambient, industrial, noise and all that kind of experimental stuff. once they've provided me with a pack of sounds, which they created but didn't happen to use in their songs. now i use them in most of my games. sound of chains included.
theese sounds always inspire me and often help to turn a game into something coherent and meaningful.