If you like the works of Ghibli studios you should come and visit it.
Everything in the museum is evocating Miyazaki's work. You also can watch an exclusive short film created for the musem. Also, the exhibition with stroboscopic lights is simply amazing.
Sadly, all the explanations are just in japanese. Because of that, you seem to be missing a part of the museum. Also, the shop seems to be incredibly crowded independently the time that you visit it.
After going out taste a coffe in the straw hat cafe, they also have artworks there.