Nice! Looks pretty rad. I've never used Zig but it sure looks like an interesting language. Did NanoVG help with the animation stuff like the little text that pops out of the beetles and the lines that zip between them?
{ vg.save(); defer vg.restore(); // undo all transformations at the end of the block
vg.translate(...);
vg.rotate(...);
vg.scale(...);
// draw sprite