I will say the art style is great, with characters that are both memorable and interesting. While the concept and story is interesting and engaging, I have to say that with it being so short it limits the characters growth and hampers the players ability to fully connect to a character, unless they can personally insert themselves into the character. This could a cause the player to be confused especially when characters suddenly act out of their established character.
I also have to put emphasis on the music because I was highly distracted by it, because it seemed as if the music was trying to get your attention, with the soundtrack being slightly out of time. It could just be the inner musician in me but the music really bothered me.
I do believe that you have an interesting world to work with and an art style that is eye catching for the average Joe to stop and consider. I suggest that you increase the interactions with the characters and allow more development between all of them. Bouncing different views or ideologies between them, would help establish the characters logic, emotions, and morals. This would outright stop or at the very least stop you from accidentally making characters that either fit a trope or have vastly different characteristics that outright refute and contradict what was established for a character.
I also highly recommenced that for characters like Mercredi, where they have a mental, psychological, and or morale problem. That you focus on the struggles they face. Especially if they are the main character, having it were we the view/judge are watching them go threw there desperate act to cling to their normality while trying not to damage there sanity or destroy there morals. This would not only help us the viewers to connect to a character but will also help in your story writing forcing the characters to either give in to whatever temptation their mind gives them or to struggle for those around them so that others don't have to suffer from their actions. With more time given to the characters and establishing their individuality you could easily avoid the player getting confused on what is happening.
One of the last things i would highly suggest is to pay attention to the music. While a story can be good without music, it could easily become great with the right music, and it could very will worsen the story if the music is terrible. Music is the lifeblood of all video games and movies, so much so that for some games that's all they need. (Frozen Synapse, Spacechem, Bastion, Dancing Line, and Scott Pilgrim vs The World.)
I enjoyed the game and the story it was trying to tell. In all honesty i wish to have a conversation with you about the game it's characters and the world they live in. (It reminds me of Beastars). If you are willing would you have chat with me?
Anyways good game, there are some improvements but that's the fun of creating. Good job you did a fine job.