I don’t understand how this is a “glitch.” When I did my play through, my friends that had played before me instead explained it as “the other half of the game,” and in fact, there’s another entire ending back there with its own set of goals and its own level design language
I mean, using the obviously portal-able wall surfaces right next to you during the slow slide along the track to the flames to get off your funeral pyre is a thing the game spends literally every available moment prior to that teaching you how to do.
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