The employment of too much music background engenders a condition that generally deteriorates the otherwise sweet lovely atmosphere and raw representation that are essential elements in the film, even failing to keep the viewer maintain a certain level of decorum to say the least. The apparent negativity tone doesn't mean the film isn't quite enjoyable nonetheless.
Invariably your first Obayashi would have been House. You will crave that same sugar rush every time you watch one of his films. You will be disappointed. Most of his other films (not all, mind) are mature and well-measured.