So I went ahead and watched it again.
Most of my original review stands, but I'll recap.
The use of real life bitmaps wasn't that jarring and the music was well suited for the mood of the movie.
It did seem to drag on a bit too much though. I did notice that the stage was no longer visible behind the starfield. One thing I did pick up on this time (another minor nitpick) was that the crowd of aliens was poorly composed. They were standing in awkward positions.
One more major issue was that there didn't seem to be a punchline. When I was writing my original review, I jotted down a note in the review box, and as the movie ended, I thought I missed the joke. It could be that your joke is implicit, but personally, I can't see what the joke was supposed to be - the movie just ended.
Like I say, it's a very long movie, with not a lot going on, and the payoff doesn't seem to be worth it.
Otherwise, I thought this was a pretty good.