My experience playing this game was a bit discomforting (not a bad thing), feeling like Minh and I were both stressed and trying to unravel a mystery. Since many of the "options" were just single choices to continue the conversation, the few times I did have to choose carried a lot of pressure. The game definitely captured the stress of real-life conversations.
As the other commenters said, I also received an ending where the experience cuts off abruptly after exhausting all the options in response to Dr. Lê's question. I also experienced an abrupt ending on a second playthrough after repeatedly selecting "inspect the blue box" in the imagination sequence. I noticed several grammar errors, such as inconsistent tenses and incorrect punctuation, but fortunately the format of this game encourages the player to click through and read rather quickly, so it didn't tend to pull me out of the story.
The most interesting part for me was returning to the "real world" with Dr. Lê, after exiting the imaginary area. The player suddenly learns important context (Minh's relationship with the unnamed voice), which feels exciting, and Minh appeared slightly more talkative/comfortable with the conversation from that point on.