Just finished Sack Boy - A Big Adventure
Pretty decent. It started out as a family project but it became too difficult after world 3 for my 7 year old. And due to camera issues when playing co op, it became too difficult for my husband and me together at some time in world 5. Other than that it was a fun game. Lots of levels and challenges, fun costumes and nice ideas. The controls were a bit floaty, but that is true for any game of the Little Big Planet franchise. And the automatic interactions between the players (bouncing on each other, grabbing, rolling, etc.) could really get on my nerves, especially in the few self-scrolling levels.
Still, all in all it was quite enjoyable. 8/10
If you're looking for something better in platforming couch co op, you need a Switch and any Mario platformer.