Impressive!
It isn't open source, right? (I had a brief browse around and didn't see any links to the source but may have missed it)
Crocotile3D is not as easy to use as it seems, the dude who makes it is an artist who is very specialized in using their own tools - they have their own pixel art tool too.
The other tools that have somewhat similar spirit are the voxel ones and the ones that are using stacking sprite as main way to create things.
Seems last updated a few years ago from a quick googling; I never used either, so no idea how they compare or how Sprytile works with the newest Blender.