Planet Physics With Signed Distance Fields

I started a project about a year ago to create 3D planet physics with signed distance fields. You can see them here: https://github.com/TigerFusion/SDF-Planets . I thought it would be cool to see a challenge using this since it is not often documented but sought after even in 2D. It would be interesting to see others ideas on the subject too since my coding skills are to the max on this project.