I wasn't able to run the Mac binary (I think something with it was broken) so I compiled and it ran just fine!
I think you did a good job of communicating a narrative and getting an emotional reaction through really limited set-pieces. Your music choice fits really well, and the minimal textures you do show add to the effect of loneliness. It took me a little time to understand the controls, or where the NPC spawns, but once I figured that out, it was easy to continue the story at a normal pace. This definitely is more in the "walking simulator" territory (and to be clear, I use that term lovingly) of interactive fiction, so it could have benefit from some smaller interactions between dialogue cues. I think you also did a good job hinting of the ending; perhaps a little too well, as I felt the last few pieces of dialogue could have added a little additional information or something. But overall, I enjoyed the setting and writing.