This is the kind of visualisation that obvious in retrospect, but I don't think anybody's done this before. Very nice.

I think the only change I'd make really is to give the top layer and obviously different colour so you can view from the top and see the current configuration. Currently it just looks confusing because e.g. a - oscillator looks like + instead.

Hmm, shouldn't this pattern be perfectly stable?

     o
    o o
     o

In this simulation it seems to oscillate between two patterns.

Very interesting visualization either way!

What does stacked mean? Is this just 3D game of life where cells die unless 5-6 neighbours and come alive with 4 neighbours? But very cool, would also be cool if you could specify initial configurations perhaps. (BTW, github link seems broken.)

Very cool! Would be great to be able to rotate/zoom the 3D space.

Very cool!