If you want to replicate this level in Avoyd, open the Voxel Editor from the main menu and import a greyscale image of a Mandelbrot as a height map using File > Import... > Image as Heightmap. Note the current version does not yet have the fancy shadows, that's coming soon in v0.7.
@juulcat@pinkprius Avoyd looks amazing! I'd love to play with it, but I'm on a Mac... now I didn't see it in the FAQ, but my apologies if this answer is somewhere on the site: Will there be a Mac version?
@juulcat@tsturm Whilst we're in early development we're not porting to other platforms than PC to reduce our build and test effort. Although the code is cross platform Mac is probably not happening due to Apple deprecating OpenGL.