I noticed the walls were talking you down and giving you nothing to advance in the game, while the notes on the ground were conversely telling you to ignore the walls and giving you codes and passwords. This points to the walls representing a self-centered point of view while the notes are the opposite. I do realize that this contradicts the thought that the walls are telling you to give up your life, but the end shows similar messages as the walls, re-emphasizing them. The walls aren't just saying "give up", they're saying more, for that could imply going to the other side, they're saying "do nothing". In the end, SGDS has to choose between two ways of dying.
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