I just found out the Castle's unbalanced difficulty first-hand.... Somehow I got there with only 3 Yoshi's remaining (this is my first play-through of the game, so I'm experimenting a bit and, thus, losing). I quickly lose 2 more. I need only a dozen or so fruit. As something of a manual difficulty adjustment, I've been trying to limit myself to the melons and my "lucky" fruit (in this case, the apples). My last Yoshi, Ol' Red, is jumping and licking away. Finally I need a single, solitary fruit. By this point I'll take anything: banana, berries, anything. Suddenly I enter one of those Question Box challenges--here, a gauntlet of buzz saws and swords. I evade what I think is the last of the blades before I jump and land just barely on the edge of a spinning saw, and Pow -- The Shy Guys take me away. Game Over. I have to start again from Page 1.
Feeling a little ashamed...
(And I've beaten Bit.Trip BEAT, CORE, and RUNNER!)
So the fault lies where? Loose controls? My own sloppy play? Or unbalanced level design? Hard to say. But that adorable theme music just became a whole lot more grating on my nerves.