I made a proof of concept of this in Unity with the Leap, and it was actually fun moving my hands around and making platforms for my little character.

• Platformer — side view.
• A 3rd person character is moving along the platforms through the level from Start to Finish.
• There are platforms missing throughout.
• The platforms of various types [not all the same].
• You use your hands [Leap Motion tested] to ‘build’ the platforms.
  • First you ‘dip’ your hands into the material that you want the platform to be.
  • Then you move your platform-hands into place so that the character moves over them without falling/failing.