as someone who studied media, this is actually such a beautifully made film, although understandably others, only looking at the surface, may see the lack of dialogue and colour in most of the film as boring.

SPOILERS (I just can't help but specify some scenes) !!

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The scene at the end that faded into colour emphasised the emotion so well and was so impactful, the heartbeat in the background...WOW she finally truly felt alive and willingly had that feeling taken away from her so he could be with his mother happily, she was only thinking of what would be best for him. Looking back at the scene where she starts humming broke my heart when I watched the end, that little boy being by her side really helped gain her humanity back.
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On another note, I think it very decently represented how some parts of society react to beings (human or otherwise) considered 'less' or 'weaker' than them, beings who may not be able to speak up for themselves and go through so much yet are still selfless and attempt to help innocents around them as best as they can with their abilities. Society tries to display complete dominance over them and make profit from making beings, obviously capable of feeling emotion (in the film they even admit she's still practically human BEFORE they start anything), their 'pets' or 'slaves'.

TLDR; great film as long as you don't judge it on a surface level !! very thought provoking imo, would recommend.