Gravity Simulator, also known as Harmony of the Spheres, is currently in the process of being rewritten from scratch. Over the years, the project has accumulated a lot of technical debt, and to make it easier to develop new cool features in the future, while also making the code base more pleasant to work with, I have made the decision to repay this technical debt. The new version of the simulator will only be deployed to production once it has all the features that the original version has.
To run Gravity Simulator locally, simply run npm start from your terminal.