VoxelJS is really cool, but not quite really suited to building something like Voxatron. You could however probably use straight ThreeJS, or go lib-less and rol

VoxelJS is really cool, but not quite really suited to building something like Voxatron. You could however probably use straight ThreeJS, or go lib-less and roll your own WebGL system. These games are all compiled from native languages to asm.js.