Just with anything which can be interpreted differently by people, I thought this movie represented our inner thoughts very well. Generally, most of the time, we try to have good thoughts and do the right thing, but whether or not we'd like to admit it, there are times when we have bad thoughts about someone or we act in a way we shouldn't have. Who we are at the end of the day is determined by which of these thoughts win in us.
The character in the movie had bossy personalities, childish and innocent, always willing to help personality, an obsessive compulsive disorder personality and others. At different times, different personalities appear. And as one personality chooses to do something bad, the good personality somehow tries to stop it but is always overpowered by the bad personality. (Very relatable in real life, isn't it?)
However, at the end of the movie, the scariest of all personalities emerges. As I was watching that, I realised it is really important to keep our thoughts and emotions in check, because if we don't and we let the negative things in life consume us, we will end up being a monster. It will not matter anymore who we hurt and this is really dangerous.
The movie is about mental health, but as I was watching it, I felt the movie is a lot more abstract than what it actually is. It is definitely a thought provoking movie.