Yeah I sure tried that, but there was just a sound playing. tried walking backwards and sideways into it as well. I think you have a bug there.
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Yeah, I apparently the error was me, I tried the white door. Replayed and could enter the red one (didn't notice that one for some reason before). I think I finished the game, At least the ritual was complete. Also I just realized backwards and sideways does not makes any sense to try since it isn't allowing strafing nor backstep.