Wily has a Death Star in this game.

Sadly, the Death Star stage isn't actually that great. Seemed to be a lot of copy and paste. The bosses in the Death Star were great though.
Other than that, the game itself can get a bit laggy at times which sometimes ate my inputs.
The stages were great. It might even be the best set of stages quality-wise of all the classic Mega Man games.
The space setting was superb in my opinion and the planet-themed bosses were pretty good as well. Their powers were good and sufficiently distinct from each other, although I barely used any of them, except against the bosses.
And finally a yellow devil that isn't nigh on impossible to dodge!
My favorite classic Mega Man that I have played thus far.