Thank you, guys.
Dave, the reflection in the fridge (and in other places) had a roughness setting that was ignored in the rendered video. I just wrote the developer about this.
Here's a more complete video. I'll add a piano track and also an alternate version of the living room with the projection screen up:
So, does anyone know of another renderer for animations that can work on a Macbook with Intel Graphics? I'm eager to try alternatives!
Strangely, this time it took 12 hours to render 3 minutes of video, so it was faster than my previous 1-minute test, despite not really having changed anything... Except leaving the A/C on all night to keep the Macbook cool. Does anyone have a 2016 or 2017 13-inch Macbook and LightUp? Wanna run a little benchmark?
EDIT: It's weird, but YouTube has trouble with straight-from-LightUp videos, adding more than a minute of a static image with no motion at the end. I hope this goes away after I edit them with iMovie.