It's difficult for me to express emotions.
I envy other people. They make faces naturally, but I have to make a conscious decision each time I move a muscle.
Every morning I go to the bathroom to rehearse what my face is going to show today.
This is relatable to me rather than intriguing or creepy. I'm autistic, and autistic people have what is called a "mask," which is where we act like allistic (non-autistic) people in order to survive. For me, masking included practising my facial expressions in the mirror. I couldn't frown for years and had to pull my lips down with my fingers. I only really got the hang of frowning near the start of adulthood. But even though I'm pretty good at showing socially accepted facial expressions now, it's still an extremely conscious action. I don't just naturally smile when I'm happy, scowl when I'm angry, or frown when I'm sad. I had to teach myself to do these things, and I have to allocate some of my concentration to monitoring/controlling my face whenever I'm around people.
So that concept in the game doesn't really stand out to me, because it's my normal. However, I really liked the idea of controlling the protagonist's face rather than choosing dialogue. The story is also interesting. Good job!
By the way, I apologise if the first part of my comment comes across as criticism. I just wanted to share my perspective as an autistic person with alexithymia.