I haven't played Knack, but Never Alone was just awful. Quite possibly the most boring game I've played this gen. But to the game's credit I could at least stomach it for about an hour. I can't even give that honor to the dreadful Tower of Guns, which I wouldn't want taking up HDD space, even if it were free (not Plus free), and that awakening game was pure crap. The moment you want me to move a 2D character with the left stick, but use the right stick to change direction between left and right, I'm out. Delete.
I never got around to charging the Vita up for the Monster game. First month I honestly just didn't care to be bothered downloading a free game since I got the service.