In the end we discover good intentions with a fairly goofy ending that sort of deadens the story a bit. I am reminded of “The Doctor Dances” and “A Christmas Carol” as we see alien technology once again trying to help but making things worse. The Doctor appears to be helpless when saving anyone with medical conditions like diseases and not breathing.
Apart from the obvious retelling of that 2005 story, the episode is pretty good and a good contrast to what we have seen in earlier in the season.
Thanks to http://doctorwho.sonicbiro.co.uk/ for the screencaps