I wrote a short guide on how to build both alignment-free and reference-based prokaryote phylogenetic trees from SNP alignments without using snippy, check it out
https://www.bacpop.org/guides/building_trees_with_ska/
Building trees with SKA
SKA is a tool for comparing small and highly similar genomes using split k-mers. This guide will explain how to use SKA to build a phylogenetic tree for different Escherichia coli lineages in a few minutes.www.bacpop.org