Just offering some insights of my own, having played PC-98 games:
The message and goal is heavily geared towards certain statistics from the ending screen.
Ex:
In the picture lgb posted, there's a death count of 3 and a bomb usage of 0. The goal states that you should pretty much bomb moar. In the MS pic lgb provided me, the statistics were very good, a 1cc with only 1 bomb usage, and a decent kill rate and an insanely high point collect rate, so it's only natural it'd say something like "Legendary Man" for the little blurb
However, as lgb said, I just did this in a few minutes so feel free to rip and tear and do any corrections if I'm wrong
Also, the 終ってます thing at the end of that LUNATIC ending screen feels more like a "It's over" than a "You finished." in retrospect.