Excellent execution from concept, to level design, to art direction and story flow. A beautiful tribute to your Granddad, Spacespy.
Update to my comment, because I do want to leave some feedback you can work with. If I remember correctly, I think you could touch up your poem voiceover. You don't need a crazy recording setup, just make sure you're in a well-padded place (closets are great), and record your lines in there. Use your DAW of choice, or even Premiere has audio editing, and I think with a small noise pass and a slight de-ess, your audio would be even cleaner. Again though, excellent work.