Press go. Space to change the type of ball you place. Click to place a ball. Steal it if you want a really bad physics engine. I would reccomend griffpatch's. Wanna see some physics that I made that actually look good? https://unibrowsercode.itch.io/water-gas-simulation
100% by me. I may add inertia varying by mass, but I am busy with other stuff. Really bad ik