it's deliberate, they even hired the same voice actress
(
HappyToast Groat froth, Thu 13 Dec 2012, 8:20,
Reply)
Well obviously
They also applied the same effects to her voice. The question is why?
(
evil_andy Stick stick stick stick sticky sticky stick stick, Thu 13 Dec 2012, 9:12,
Reply)
I've heard
that Guillermo del Toro really liked Portal, and being Guillermo del Toro he called Valve and did some persuasion.
(, Thu 13 Dec 2012, 9:20, Reply)