Imaginative
I could really see the river rushing past. The texture (the feel) of the song was very well-done.
The chords kept things pretty interesting too, though there was one just before 0:50 that seemed to go nowhere, and the ending was a little too repetitive.
A nice and unique piece, overall.
By the way, did you use the GPO to make the instrument sounds? I only own Finale 2007, so I don't know if this applies, but you might be able to select different "playing styles" for the playback. The sound wasn't bad, but it probably could've been a little better too. It sounded like all of the dynamic highs and lows were equalized, for some reason.