First of all welcome back. :)
How nice that your ceilings are back in one piece.
Thanks for the "demo" on the puzzle. That was very helpful ;)
I like it and it is good to finish despite the "darkness".
However, I wouldn't put a time limit on it like that with more pieces. That might be a bit too "annoying" for one or the other, since especially the parts with the black border (on black) are a bit "invisible".
I have one more suggestion, although I suspect this may be difficult for you to implement. I would find it more authentic if they were not puzzle pieces, but real fragments of a destroyed mirror, to be put back into the frame of the mirror, so to speak.
Don't overthink it too much ;)
I'm sure everything you present us will be wonderful.
<3 Yanonako