This reminded me too much of Totoro and Spirited Away. I enjoy the former, but the latter, once they get to the scene where Chihiro professes her love for Haku, it loses me there. What does a 10 year old know about falling in love? It's a bit too much of a stretch for me.
Anyway, I just found the structure of this too similar to those. Starts off just normal, "real-world" things, then they go off and explore, then find some fantastical world that they just accept with absolutely no hesitation, meet people that they just blindly accept and listen to with no hesitation, dead faced just do what they're told to do by these random people, a cute little blob thing with a funny smiley face to pander to the cutesy crowd who love their plushies and merch. It was like deja vu.
I actually started to doze off towards the climax.