Player State Machine*
  Grounded*
    jump -> Airborne
    fall -> Airborne

    Idle*
      move -> Moving

    Moving
      stop -> Idle

  Airborne
    land -> Grounded
    mount -> Walled    

    Airborne_Base*
      jump -> Ascending
      fall -> Descending

    Ascending
      apex -> Apex

    Apex
      fall -> Descending

    Descending

  Walled