Why does "Difficult" = "Bad"?
So why does everyone feel that difficult games are not good? I see this theme over and over. Once upon a time, games were difficult, and that made them enjoyable, and very satisfying once you were able to finish them. For those who grew up with the original NES (the 30-40 year old crowd), this was the norm.
This was a typical platformer with a twist, that at the end of each "world", there was a level that featured a more open ended design. It is pretty well described in the GameSpot review. It is not a long game and from start to finish probably takes 2-3 hours, if you don't die.
I liked it, and still like it, because not every person could just pick it up and burn through it like a lot of today's games. It separated the men from the boys, to a degree. Although once you pass the first world (finish 1-4), most can start to afford the upgrades required to make it the rest of the way without croaking.
So don't be a wimp, drop the 500 Wii points, get this game, and settle in for a challenge.