Hi everyone! I just released a physics tech demo on itch.io. The world is entirely simulated using particles and you can get some different material behaviors as well, like liquids vs solids. Eventually I will add many more materials, and if you have any materials you'd like to see included, fee free to let me know.

Here is the itch.io page: https://kotsoft.itch.io/mpm-tech-demo It is best to install via the app.

And also a video demo:

Screenshot: