This, is what I call the epitome of platforming. There is no buttons that can help you to attack; it's simply acrobatics and platforming.
And for those who think that the nightmare is impossible, it is NOT impossible. You just need to have a high enough level and a lot of perks (dashes and double jumps help a LOT).
The end is kinda "meh" and predictable, but heck, this is made WAY back in 2009, and it's a FLASH game. For a flash game, I can say it's one of the best flash games I've ever played.