Bug: I can't enter Albert's torso room anymore... I can go into this part of the rust area, but I can't get into that room. And yes, I had the rusty knife equipped. All it does now is sending me back to the beginning of the rust area, where you're supposed to get to Albert.
And: When I tried to use the black key shortcut, I got stuck. I wanted to leave through the garden area door, but it closed infront of me. I tried to open it again, even with the black key, but it remained shut. I had to restart. (And it was such a good run, too...)