Wow, this is very good! What sample is the harp? I love how it sounds slightly detuned or something.
I don't dig the drums much, I get that you want to achieve a "prog" feel, but they sound so unfitting to me... I think this would sound much better with standard drums instead (like it does after the beggining!).
By the 2:20 mark the song feels a bit stale, you could try a tone change or something there. Or maybe mute the percussion and harp for a while and let another instrument take the main spot for a small while, I don't know.
In any case, I love the mood of the song. Very unique for such a remixed tune!