The First 15 Minutes of Knytt Underground (Wii U)

Copied from MobyGames:

Knytt Underground is a side-scrolling exploration platformer with a simple basic goal: the world is about to die and so the protagonist Mi has to ring the six fate bells. Since Mi is mute, she quickly gains two fairy followers which do the talking for her. Those have different personalities and in some conversations she can choose which one should talk.

The game is divided into three distinctive chapters which can be played in any order. The first two are relatively linear sections which introduce the the two main characters Mi and a rubber ball. In the third chapter the two characters merge and Mi can transform to the ball at any time - with the abilities of both characters at hand, the player can now explore the world freely. Since this is no metroidvania game, there are no additional powers and items to find, but of course there are still obstacles to overcome in order to open up more paths: NPC quests, platforming and puzzles.