Amazing job for a first movie
I must say, this is excellent, I would definitly like to see more. I'd only suggest maybe making some of your drawings crisper and possibly more detail, but for the most part, I think your drawing style went really well with the movie.
I did notice many similarities to the war scene in The Animatrix's 'The Second Rennesance Part 2,' including the scene where there are shots being fired at the oncoming ships, the mushroom clouds in the background, the generally dark atmosphere and the fact that you used the same music.
Nonetheless, I think this is an amazing flash, and I commend you even more for borrowing ideas from one of my favorite animated battles. I really look forward to seeing another!