Decent enough ep. The tone seemed a bit muddled, as they seemed to be going for a spooky vibe while simultaneously keeping the "lighthearted" mood they were pushing last episode too. Kind of threw me off. I liked the baddies, though, and I appreciate a story where the sonic or TARDIS can't be used to just magic out a solution (except for the TARDIS Ex Machina at the end, I suppose). Also was very happy to see Wilfred! I was entirely unaware they had gotten scenes with him before he passed and was just expecting references. Overall I enjoyed it and am looking forward to next week!
*One little minor technical nitpick - if there's literally nothing outside the ship, and the captain wasn't wearing a helmet, how did they decompose?
Probably would be seemed stranger to most people if they weren't decomposed - they'd assume she wasn't really dead. Best to supercede scientific accuracy for the sake of clarity.