I think it’s a mask diagram not a die shot, in any case these features are common for that era especially for the metal layers / ic traces look at die shots of a Z80 and it’s clones.
Ah, yes. What do I know... but this Russian CPU still looks much more "weird" than a Z80! The Z80 has 90 and 45 degree angles, this thing also has like 10 degree angles, and wavy structures, and big curves, and triangles.
I'm curious to see where you see the odd angles. When I zoom in sufficiently all the shapes seem to resolve to segments of 90 and 45 degree angles.
Well OK, there is only one triangle - in the upper left corner. The other things I mostly see in the center and right of center. Especially in the blue lines - power and clock or so?