There's a plugin I suggest you check out, called Lo-Fizer.
It allows you to simulate different types of weird noises/effects on a track. You can layer vinyl crackle, put a filter on the signal as if it were passed through various types of speakers, add a pitch flutter as if it were played on a cassette left out in the sun for 5 hours, all sorts of interesting things.
You could probably modulate those parameters and have a piece like this morph over time.
I noticed the solitary string instrument didn't really evolve that much, and there weren't other instruments layered on top to draw interest. That said, the vinyl + string combination sounded really cool.
Reminded me of RE4 a little bit. Pretty cool.