I finally finished last night. The final two episodes were much, much better as I was getting quite impatient with the pace.
The revelation about the room was very nicely done as were the notions about time being all around you, but there was no other "oh yeeaahhh!!!!" moment for me. I'd kinda hoped it was all some flash forward and they'd be all together, young, and just be like "fuck this house!"
Also, it speaks to a gender bias that the top-billed actor (playing Steve) comes above Carla Gugino, who fucking carried this beast throughout, but gets pushed down to second place because, what, men might not tune into something with a female lead?? Bullshit.