Wow, this looks fantastic.
EDIT: Well, except for the boss designs.
I actually REALLY like the boss designs.
You also have to think of it as an offshoot of Megaman-- Things are a bit more detailed here.
My only real gripe with the game are some of the elements obviously look like flash (the Vines in Leaf Man's stage, when Rolling Man rotates and Etc). Also, there are more than three enemies on screen at once in some points (the whale boss, for instance).
Other than that, I would say it's probably the best fan made outing next to Rockman 7 FC.
The Music is also amazing, and the level deigns are doing some things that even put Mega Man 9 and 10 to shame.
Pure Genius.
Maybe the images in the artbook will change your mind?
http://king-soukutu.xsrv.jp/rokkobook.html