I'm... emotionally exhausted, lol. Incredibly satisfied with the way it played out in the end, but was slightly bittersweet in some respects.
The ending I got:
Now for my evil playthrough
There was one particular moment that hit me like a tonne of bricks:
I let them go in the hope that they'll come back at some later date for a more climatic stand-off, where perhaps I'll be able to do some more gloating.