The tender-hearted part of me wishes there was an ending (maybe with max compassion & zeroed out disdain or something) where Erx can be given a chance to survive without taking Yuni's autonomy away, since it seems like an interesting idea to have those facets but in-practice they're mostly just present as four manipulable health bars. That said, I think this explored its scenario well with a card game that was simple but surprisingly difficult without feeling annoyingly unfair! I get the impression the intent is for the narration to be very emotionally biased and not strictly reliable, but I can see how it might not translate to someone who isn't ready to make that sort of assumption. I think you did a good job with it overall though!
My one nitpick is that the way the different stat bars works can lead to a lot of back and forth "dud" turns where the characters stall out until the deck shuffles around again. It really slows the pace down in a way that a discard or skip turn mechanic could resolve.