The whole world has been repainted. Here's what's new:
Underground: hand-painted rock layers, from topsoil and roots through clay and cobbles down to bedrock with gold seams and crystals.

Surface: a scorched battlefield with trenches, sandbags, barbed wire and tank traps, plus a concrete bunker entrance.

Sky: a painted war sky with mountains and burning towns, with drifting clouds and rising smoke.
Steel lift: riveted steel shaft, sliding doors and floor displays. Soldiers now ride inside it out of sight.

Battle mode: your bunker and the enemy's match the new style, with concrete frames, lighting and a new entrance.

Fixes: soldiers no longer float above the ground, and the hint text is easier to read.
Thanks for playing, and keep the feedback coming.