Oh gawds. They removed the slide and the charge buster so we're really back to origins, including some cheap ass stage designs that seem made exclusively to infuriate me.
The bosses are really easy, some of the mid stage bosses are harder than the actual robot masters. Willy was a pushover as well (after figuring out his pattern, that is).
Gonna try the proto man run sometime later but this was not as good as I remember it being when I first played it.