Watched the movie, and Enjoyed it. It is a good movie from various aspects...
... such as directing, acting, cinema-photographing, atmosphere, the ambiance of the gym-s and the fights, the training, the movements, and the devotion of the young actors for conveying the characters.
When reading the actors background, you don't notice any martial arts experience there, but... they obviously trained much, and well, for their roles in that movie making. Precise, direct, economic movement fighting.
And kudos for the director for her courage in that MMA direction. She deserves it. The director did not prolong the fights for the sake of attracting "fight oriented" audience. But retained the focus on the story.
The movie as story telling, is not perfect, but it is believable and flowing. As the phrase goes... "kurz und scharf" (= "brief and sharp" = ~ "straight and to the point").
That movie's name, and subsequently its "description" here and elsewhere... are misleading and not fit with its contents. Pity. It might draw 'wrong' viewers to it. I wish the description would be changed...
Usually I refrain from writing reviews here, but prefer to be reading them. But now... as this movie is still fresh in the arena... :-) and I see only one review ...which missed entirely the whole point of that movie making (and pulls to misleading directions...), I thought to do something about it...
also, at times, I look at the movie and its fights from a different perspective, as been dealing with various martial arts (mainly Budo Taijutsu) for over 46 years, (as part of "way of life" although dealing with visual arts, design and architecture as my mainstream).
So. In short, watch and enjoy.