This? https://bydarkcrusader.itch.io/mongol
Ye more specifically the later iterations in 3D: https://bydarkcrusader.itch.io/mongol-corpses-of-the-divine-browser
The hard edges themselves don’t wobble
No, they do wobble quite a bit. What I mean is, it is very obvious that before the shader is applied, the edges look like this:
I.e. they are very jagged. Then the oil shader pronounces this artifact and makes all diagonals look like explicit staircases. But because these aliasing artifacts are by no means stable, the "painted staircases" wobble around. Especially while you are moving. It looks like fish flapping.
Video https://files.catbox.moe/x2kn2y.mp4