Alright, this is quite nice. Small but very interesting and weird, the 3D renders really adds value to the experience!
SPOILERS AHEAD
An unreliable narrator (the consciousness?), de-realization, de-personalization, can’t remember anything, and can’t see faces. The MC of this visual novel is obviously mentally ill! maybe a high level of dementia.
However, I can’t explain the fake entrance of the building, it makes me think of a completely different interpretation:
The MC has been kidnapped and forced to live this way by the Narrator, who constantly gas-light the MC to ignore everything that is off.
Who knows.