I like it a lot. Reminds me a bit of some early Jethro Tull or King Crimson.
The part from 0:45 to 1:15 is especially nice but I enjoyed the rest of it, too. I didn't hear a lot of 'dissonant' chords, I'd rather call it agressive. The opening chords could be a bit stronger though, in my opinion they sound too sweet for this kind of piece.
You labeled it a prelude and I can imagine this as an introduction to some bigger piece. Standing alone I feel something would be missing. You build up a lot of tension that has to be released later.
The sound may not be that great but it's good enough to provide a good idea of what it should sound like.
Thanks for posting.
Marcel