This is the first movie from Studio Ponoc, who shamelessly is trying to be the next Studio Ghibli. The company was founded by former Studio Ghibli lead film producer Yoshiaki Nishimura in April 2015, due to the dissolution of the Ghibli's Production Department. The story is based on The Little Broomstick by Mary Stewart.
In terms of visuals and audio, the movie is there, it really looks and sounds like a Ghibli movie, the animation is superb and there is no shortage of creativity. You will recognize the characters with the same look as other Ghibli works. Everything says "this is a Ghibli movie".
Unfortunately, the story is where everything breaks apart with problems with pacing, parts that are really boring (I ended up watching in 2 seatings as it was not engaging enough), there are plot inconsistencies, predictable outcomes, not enough thrills or tense moments, the characters are not developed and have inconsistent personalities, the antagonists are quite bland.
Overall, this is a good first attempt, if they can get their storytelling right we can expect some great works from this studio, at least on regards animation and sound they did an excellent work that is a worthy successor to Ghibli, however, I still think they should try to develop their own style instead of limiting themselves with the past and the storytelling really needs to be worthy of their animation quality. In a way, is sad to see so much effort put into the animation alone, for a story that will be quickly forgettable.
The dub was excellent too.