It only need be as enjoyable as it is...
The music romanticizes the image and vice versa effectively. I felt at some times they weren't really responding to one another though. Maybe in production they were, but it got lost in the final presentation. Or then, maybe they were suppose to break off onto their own tangents here and there.
But I do feel some level of pretension with regard to the 'purpose' of the animation. This idea that the art is meaningful requires some clarification. What you did was design a visceral experience. What people imagine, or what it evokes in others beyond a visceral reaction, is an appendage beyond the scope of what has actually been designed here. That is, unless this piece was a practice in iconography. According to your responses it seems it wasn't.
And although it seems to have challenged some, perhaps I'm too laid back. I just sat back and enjoyed it. It didn't really need to make a statement or take me to some magical place to be effective or deep. I personally didn't feel challenged, but then, I didn't attempt to interpret it as text.
The idea that it is to make a statement sours a rather pleasant aftertaste. I feel as though both you and the angry reviewers are making the same mistake, just from different ends. Of course, this aught to be a review of the flash rather than the reviews, so there's your score.