Simply put, sprite animation at it's best
This may end up being quite a long review, but here goes. This is the probably one of the best sprite animations I've ever seen on Newgrounds, and I've been coming here for a long time now. I'm probably a little biased because it's one of my favorite 2-D scrolling game series.
The Animation: I've seen some people have trouble with sprites, but your work was practically flawless. The sprites seemed to be almost perfect, as sprites go. The scenes where you used actual pictures fit in perfectly, fluidly, and kept it going well. The fight scenes were well made, the fights sensationally choreographed, and the explosions in true Megaman style.
Music: I'm impressed with the fact that you kept the music, for the most part, from the game. Music makes a huge difference between a good flash and a superb flash. Again, you took my breath away.
Story: Yes! You did it right! You gave enough of the story to keep us waiting and hoping the next part will be out soon. Overall, you've done a great job. The voice acting was a plus, it's rare to see that in Megaman sprites. GREAT JOB.