For what is was intended..
You did very well. Yes, its short, but you stated that. Its a demonstration of your skills and something for a class. The amount of people who do not read are disturbing, to say the least. I gave you the score you deserved for what little work I saw, which was very fluid and quite impressive. Better than Gran's general, but hes usually making things so large he runs out of time and rushes.
Make something worthy a little later, eh? I'd like to see more from you.