strongly agree

The weighting for those could be configurable.
I do think you might be running into a bug that I need to correct in my alg (first thing I ever added to HW )

Here's the issue as I see it.
Right now, when damage occurs, the area is flagged as dirty. Once damage phase is over, cleanup begins on those blocks.
But, let's say 2 blocks are side by side.

_|x
x|x
x|_
_|x
Iteration proceeds over the 1st block, the one on the left. Those 2 pixels each have 3 neighbours, so live. Since no cleanup occurred, we drop that block and move on.

On to the block on the right. 1st one only has 2 neighbours, dies. 2nd one has (then) only 2 neighbours, dies. 3rd one only has 1 neighbour. Dies.

_|_
x|_
x|_
_|_

We are left with that. Block is reswept due to changes, but there are no further ones, so we drop it.

Result: 2 pixels, which is kind of hard to see. Otherwise, 4px is the typical minimum (with a cross of 5 or larger circles being most common), which is pretty easy to see.

I'll take a look at this tonight I guess. I guess if I do deletion on an edge, I could tag the neighbour for a resweep.
I could also not cross block boundaries. That might mean some odd erosion appearance, I'll have to test.

Went ahead and pushed an extra recheck of neighbours, I think that should eliminate the small strays.

Also rechecked what sweeping 4 neighbours or less would look like. Was interesting, but not really properly fire-damage-y, so left it at current count.

thank you, seems so much better now