When I listen to this I see Darth Vader's tiny little ship going through a smashed Imperial Fleet, but anyways good job for straight from memory.
Well, it's not bad, but it's only one instrument, it's short, and you fudged one of the notes. The progression goes B-B-B-C-G-Eb-Low C-G-E. Otherwise not bad.
I've composed this short from my memory, screwing just one note is a huge succes :D :D