The two bosses that are easiest with the Mega Buster is Galaxy man and Splash woman.I got 999 screws and I am going to save Wily for tomorrow.
i beat three bosses so far
Galaxy man does seem easy with the M. Buster, but i found his weakness...
Splash woman was easy too, i didnt have the proper weapon against her but the M. buster was enough (usually is actually, just gotta know the patters) but she was maybe two easy..
Concrete man was the easiest so far, and i think i know who i'm going to tackle next. I have a pretty good idea i have just the weapon for them, so they're getting pay back!