I can recommend Knack all day to anyone who enjoys an old school style platformer/beat 'em up. It's like a mix of Crash Bandicoot/a Pixar film. I beat it 3 times in a row to unlock all the forms/gadgets, it's addicting if you like those type of games. I'd say it's prob my favorite game on the PS4 (having not played Infamous yet). I like that style of game, though, where as many people feel that kind of game is outdated these days.
I'll give that a whirl... sounds good!