Well, here is some friendly advice....
The idea is great, (though, it's been done before a million times, lol) and you used an exelent choice of sprites (I believe it was Megaman X5 or X6, am I righ?). I'm a very big fan of the Megaman X series, and I'm sure you are too, and I'm sure anyone will agree with me when I say that the thing that makes Megaman and Megaman X games so great and unique is the backround music with X and Zero's speed and agility.
I think the greatest option here would to increase Zero's and X's agility by a tiny bit and add some good Megaman X music, you know? Something that will realy speed things up. There is a huge collection of Megaman and Megaman X music out there, including Re-Mixes and Techno Trances, so just be creative... :)
Anyway, I hope my Advice will help you out someday, I realy do.
Keep it up!