Hi goldentone,
I think this improvisation is very creative and does, in fact, suggest a journey, a spiritual one, given the title. The piece begins in G and ends in D with many changes in between, so I think it's safe to say it's polytonal. In making some of the changes of tonal center, you introduce some interesting altered chords producing very interesting harmonies and turns of phrase. The music seems to paint an ethereal world of vision and sound as one moves along the way. Good job!