I watched the DF 1080p video (as much to test my new PC's 1080p playback which the old couldn't do) and I thought Knack looked very good as a traditional game. The timing and balance of the enemies looked good and varied, challenging to learn and execute on but not impossible. I don't know what difficulty that was. Anyone wanting an HD PS1 style game experience, it looked good. Can't say I'm into that myself, but it was very much in that vein and would likely appeal to fans of the genre.