You could have been much better.
Your game was in a point decent, through if you use Megaman in 8bit, the tiles of the enemies and the background should also be in 8bit. However I´m a spriter, who always like to lend people like you a hand, since I´m looking for this kind of work.
One thing, there is actually a better program to use. If you need help for Multimedia Fusion 2 just search for N64Mario on Youtube. He has done some amazing work and I can assure you that you won´t be disappointed.
So, show me what you got next time. ;)