I only wish they had used Mega Man 3 for the basic engine... MM2 wasn't as smooth as 3~6.
I disagree. The engine for MM3 and beyond really sucked the awesomeness and kinetic energy out of the series' presentation. Transitions shouldn't fade in and out; they should snap. Death explosions shouldn't be bewbewbewbew...; they should be DNNVDNNVdnnvdnnvdnnv. I heartily approve of their course of action.
But the music doesn't sound like Kawakami at all. Time to go rend my garments in anguish and stuff.