I think the intro goes on a little too long before the music starts in.  The beating drums when they start the first time could be louder, when they start up again in the latter part of the song, can't really hear the cymbals.
The radio transmission part makes it a little confusing - we hear that it's Columbia, and the 'we've got a problem', then it picks up again (maybe a repeat of an earlier part, or a new one?).  I'm not sure the 'one small step' part works at the end, might be better to let the music play out the story.  IF you really want to keep that, lower the volume a bit on it.
Very Floyd-y!