Thank you! I'm glad you took the time to play through Bad Faith and speak honestly about your feelings!
SPOILERS
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Yes, that bitter taste at the end was intentional. Magda does indulge in brutally killing off Cerise and Eve - understandable, given how she was bullied by them.
But when she kills them, is the core of her grief and anger really solved? Sure, it felt great in the moment - but when her adrenaline dies down, Magda's still left with the pain they inflicted on her. In essence, her actual consequence is never getting to heal from that pain (and also having her body hijacked by an inhuman entity.)