Really good...
I thought that the animation was really nice (even though most of it was ripped sprites)! I liked the fact that you could READ the dialogue... where in a lot of these Maple Story tributes you cannot, or other NG submissions for that matter! My only complaint was that it was too short! So you might consider extending the length of the feature next time!
This is unrelated to your capability of the design of this Flash... And I feel kindof dumb asking this... But, what game system is Maple Story on? I've seen enough of these movies to be interested in playing the game... if I can still find a copy! I don't even know how OLD it is! Please PM me if you see this!
In closing, I would think that if you animate like this regularly... you should come up with an original idea of your own! I bet that it would do quite well, at your skill level! Thank you for your time...