Terrifying and hopeless. I like the fact that you added some clarification at the end like the fact that she was completely sober and not on drugs meant that she had realised the horror of it. The gunshot reminded me of the scene in "Pet Cemetery" (1989) when Gage is hit by a truck and the father's mind flashes back to all his memories with his son in a split second.
Unusual concept and sad plot. But in my opinion it would be more correct to call the game something like "SOCIOPHOBE" instead of "INTROVERT". Cuz social phobia and introversion are very similar but different things.