Peak is now my go to coop game to play with the kids. You can play alone, but playing together increases your chances of getting to the end, and I love that.

We had fun playing this together as a family. The controls are easy to learn. So far it hasn't been too difficult or too easy. It gives opportunities to learn to work together. There are risk vs. reward decisions to be made as a group, e.g. "Do we go straight to the portal as soon as we can, or risk being blown up while exploring for more powerups?"