Ambient, incidental music. Not for everyone.
First off, as a person who likes a diverse selection of music genres, to me, instrumental music, whether its derived from orchestral, rock, blues, country or simple acoustic, etc., is probably my favorite type of music, as these types of music/songs incite more feelings and emotions than music/songs with lyrics that are sung by singers.
This particular song that you have crafted is very catchy in a sense, that the repeating sound of the harp strings grab your attention and keep you interested in the song itself. The way the melody was put together gives me a feeling of wonder, curiousity and bewilderment, as the piano plays and dances within.
Nicely composed work. As another user stated, this is not exactly a song that would be carried around in most peoples' IPods, however, that's not to say that this particular song is not without its own merit.
I can imagine this song to be used in conjunction with a video game type setting, along the lines of an RPG game, similar in fashion to the "Final Fantasy" or "Secret Of Mana" series, as it seems you (the composer) might have been influenced a bit from fantasy themed music.
Overall, I'm quite pleased with this song. Most importantly, its the type of song that didn't make me want to stop listening to it.
Well done.