In terms of bigness, musicality, atmosphere, purpose and 'coolness', I thought this piece was great. In fact, some parts were just awesome.
However, I didn't think it was so great in terms of re-listening value (perhaps too many repetitions?), twist (no harmonic changes popped out at me as being... inventive; maybe I'm just being a jerk, but I'm trying to get used to this critiquing thing), and depth (I have to say I did think the piece was lacking in 'intellectual' qualities, like counterpoint ).
I completely understand you're not in your prime or probably anywhere close to it, so it can't be expected that the piece was masterful; considering that, I say well done, better than anything I can do right now.