It has that exact right combination of seriousness and absurdity and body horror and science fiction that is Dr Who. They nailed it.
That whole entirely unnecessary gravity bit, ridiculous and absurd, but funny.
Donna almost getting left behind, the captain commiting fucking suicide shows the seriousness of the episode.
I just loved it.
It was nice going into it without knowing anything ahead of time. It felt like a proper Doctor Who episode and I loved it.