Kids Friendly games ease up on the difficulty a little bit, making players less aggressive when it comes to stealing the ball or blocking your shots. It also allows you to make more sliding tackles, with less chance of being shown a yellow card by the referee. If you're a more serious player, you'll want to stick with Friendly Match, but kids may enjoy the lighter mode more.
Atlas is an action-rpg with rogue-like elements where you use your ability to control the ground to fight the enemies and move through procedurally generated worlds.