You cannot damage the boss directly. You must make him hit himself.
To "fix" a duality game is to perform surgery on its foundational mechanic. A fixed duality system rejects the zero-sum game. Instead of two opposing meters that drain each other, imagine a two-axis graph: "Empathy" versus "Justice," or "Tradition" versus "Innovation." The "fixed" walkthrough no longer says, "Choose A to gain +10 Light points." Instead, it advises, "Choose A to advance the narrative toward reconciliation; this will lock you out of the revenge ending but open the coalition ending." duality game walkthrough fixed
Never let your integrity drop to 0, or it's game over. Use D.O.S. or EMP attacks carefully, as they reduce target integrity; if the target server disappears, you may be unable to finish the level Steam Community. You cannot damage the boss directly