One word - amazing.
I just want to say how incredible it is that you managed to use these sprites from two different games and mold their game-specific animations PERFECTLY together to make everything look so fluid. The choreography of the fight scenes is just absolutely insane as it is so fluid and balanced! Not only that, but the quality of the sprites is incredible too. They're so clear and everything looks top-notch.
Putting a story behind this flash was done to a T. While just having a random fight scene would've been nice, you went the extra mile and weaved an amazing and simple story into it making you feel for the all of the characters involved!
The graphical menus and credits are incredible as well. They're also top-notch and not some low-budget shit like just white text across a black background. Also, having the interactive links was nice too seeing as this flash is actually pretty long.
Overall, everything is top-notch, sharp, concise and high quality. Good job! I look forward to seeing a third installment!