This was a great experience to play! I love the story concept.
Even though Goldie was a nice Doppelgänger, things still ended up going the way they usually do in these stories, which creates an eerie sense of inevitability. Mari might have remained stuck with her unsatisfying life otherwise, but being faced with an idealised version of yourself who is nothing but good and kind and only wishes the best for you didn't make it any better for her either. And it makes sense, because being confronted by who you could be without all the issues and ingrained self-manipulation and accumulated exhaustion from trying to get through life isn't something that'll feel good.
It's very easy to turn into Mari and become too tired and angry and resigned to have any energy to even want things to be better. Putting all that aside to open yourself up to a chance to improve things is hard. I can definitely relate to her. Even when you know it's not ill-intentioned, people being unflappably optimistic to the point that it feels like they don't see your pain and your difficulties can feel very frustrating.
I think it was a great choice to not have a "good" ending where suddenly everyone gets along and is happy following their dreams. I appreciated the look at the bleak way the situation turned out no matter the final choice rather than having a feelgood message,
The music was well-chosen and really brought across the underlying horror atmosphere. All the aspects of this VN came together very well for a coherent experience. Great job by everyone on the team!