I liked this one. The levels are puzzling without overdoing it, they're challenging, rarely being unfair, and it's just long enough to not overstay it's welcome. In fact, I wished it were longer.
Couple of points of interest you may want to take into consideration or I myself find curious:
-The Piranha Plant boss lags the game really hard.
-The change from a regular YI-styled hack to a Mega Man one is a bit jarring. I don't mind it, the levels are good, yet the turn in direction is not something you see every day.
-Getting Yoshi after finishing Wendy is neat, but he wasn't made with this set of levels in mind. His behavior can be a bit glitchy at times and on occasion you may even need to dump him because there's no way to continue on otherwise. Luckily by then you only need at most 3 more exits, so it is not a big deal in the end.
This hack was in general a lot of fun! I liked all the Mega Man themed levels. Levels were well designed, fun, and looked nice. Some levels needed could of used an extra checkpoint
For example #2 Air Man, that level was pretty long and having the check point a little lower down the level or having another would of been nice. In Finale - Wendy, the checkpoint was in a good spot but another one right next to the boss would of been nice to avoid having to do that entire part again, which was fun but a little time consuming.
Overall a really great hack! Keep up the good work!