It’s like an avant-garde version of Turn Left, with the concept taken so much further,

I had nearly the exact same thought - a classic RTD “Doctor Lite” episode, but put together so much better than they were during his original run.

It’s a complete mood piece, and I’m sure there are people who didn’t connect with it, but I think they nailed it.

Maybe we weren’t meant to know.

Yup. This new swerve into the supernatural means that the old days of half-assed “aliens did it” explanations are over, and we can probably expect more “it’s inexplicable” endings. Again, that’s probably not going to sit well with everyone.

I do wonder if there will be longer-term implications for Ruby’s ongoing story arc - they did a good job of weaving the snow into the story without offering any suggestion of what it all means.