Starting around 1:43 and going until around 8:08, it almost feels like a texture piece for a lost level from The Legend of Zelda: Ocarina of time. Think Death Mountain as adult Link, but without a musical structure.
It's an interesting piece, given it uses a single instrument and it successfully invokes imagery. That's hard to do.
I'd also like to know about the title, where it comes from, why you chose it for this piece, etc.
My only major gripe is you state in your description, as I perceive it, that you want to show that silence can be used as another instrument. I don't think that came through at all. There isn't much silence because of the reverb and delay present in the majority of this piece. I'll admit I'm not entirely sure how you would do this, but I think it would be helpful if you were more blatant in your use of silence as an instrument so it is easier to perceive it that way. That said, as I haven't heard anything like this before, I'll give you the benefit of the doubt.
I hope you find this review helpful. :)
More info about how I review music here: https://codefreq.newgrounds.com/news/post/1089806