I just played some of this game, (the downloadable version) and it's awesome! I really like how much thought was put into it, making two games that people hated because of how they worked into a full-on Mega Man game that looks like Capcom created it!

I do have some things to suggest though (just some minor things):
*The music: Maybe some 8-bit remixes could be used for the music, instead of music from other Mega Man games. Not saying that using other Mega Man game's music is bad, I'm just saying that original music would fit better.
*Art: Some art was taken from other Mega Man games. I could try to create some (after all, I do work with sprites) if you like.
*Mega Man hovers a bit when he slides: I've noticed in some engines that Mega Man slides off the ground a little because of his sprite size. I guess putting his sprite below the ground a little while not changing his collision should fix it.
*Palettes: This isn't a major thing, but I noticed that some of the palettes are off. Some minor tweaks could fix this.

As for stuff that should be added:
*Charging: I know that charging your buster wasn't available in the original Mega Man DOS games, but it would be a nice addition to the remake. If it doesn't sound good, then maybe you could add it as an option (I like the ability to charge busters, pls no hate).
*Saves: I guess a text file could be used for storing saves instead of using passwords.

This is an awesome game, with awesome features, and more! Sorry if my list seems a little long, it's not stuff that's wrong with the game, just stuff that I would like to be added/fixed. If you want, maybe I could help develop. After all, I know an engine made in Game Maker that's really cool (the Mega Engine by WreckingPrograms), which I could port the game to as well. It wouldn't be that hard because I could port most of the object code over. I could also make some art and add some music for the game (all credits would be provided), and maybe even fix some bugs. I'd really like to help . Thanks for making this game, it's really cool!

P.S. Is there any way to go fullscreen? If so, does it change your screen resolution? Just asking, thanks!