I expect this game to be easier than it is since it is A) flash and B) has very crude graphics. I love flash games and crude graphics, but to me they generally imply a more story based experience whereas this has very difficult platforming sections.
The other problem is that the difficulty doesn't seem to add anything, it's just difficult for the sake of difficulty. We don't get a sense for why we're struggling or why a particular room is harder than another. In a different game, a high level of difficulty at the final boss (for example) is expected, likely foreshadowed, and adds to the satisfaction of beating the game here. In this game it just feels like an endless grind and I'm not sure exactly why I'm toiling away.
That said, the graphical style is awesome.