I am struggling with symmetry math, because I noticed that something was broken (axis symmetry did not work any more, and fixing that broke something else ... or rather revealed that something never actually worked).

The details can be found in a thread:
https://www.gamedev.net/topic/656527-how-do-i-simplify-the-symmetry-math/

I make slow but steady progress on that battlefield.

Since the last screenshot I also changed the height between layers from tile size to 3/4 * the tile size.
The maps are more radable that way, I think, because parts of some covered tiles are exposed.