I believe this is the first time I've changed my vote on an episode, and it wasn't for the better. While watching it had a brisk, urgent, faintly survival-horror-ish feel that was decently engaging, but the more I think about it the less I like it overall.
For one thing, this episode started in a really bright, almost goofy way, with the teleporting invite, Lady Barf, Ryan working through the hallucinations and the green-haired pair, and then spun to the survival stuff, which jarred. It was also pretty predictable - as soon as I saw the elderly couple I
knew one or both of them would be dead by the end - and derivative - I too thought of the
Metro games, for example.
A third death-heavy episode in a row, too, with such a focus on killing the characters you liked, the nicer characters, I was honestly expecting the kid to die. Still, if it keeps the gorehounds here happy...
And yes, it was very heavy-handed at the end, to the point even I, who would very much like to whack several world 'leaders' hard in the face with an anvil marked "do something, you idiots", thought it a tad much. The generic, one-note mutants didn't exactly help, either.
I'm really hoping for a true lighter episode this season, for some real tonal variety. As others have alluded, there's a dark, heavy undertone to much of Chibnall Who that weighs it down just a little, starting right with the near-industrial take on the theme. The show could do with being a little lighter on its feet.