softpixels’s review published on Letterboxd :
This movie could not be improved in any way.
That said, it isn't for children. I'd let a 5-year-old watch KYUURANGER, knowing that a few things would go over their head... but I wouldn't let someone under 15 or 16 watch this film. It's... it's intense. And brutal. And moving.
I wouldn't want every Super Sentai movie to follow this route, but this one, for this series, at this time, was perfect.