I used the same Matter.js for a game project I was working on and I would definitely not consider it a scientific physics simulation. It eventually got the job

I used the same Matter.js for a game project I was working on and I would definitely not consider it a scientific physics simulation. It eventually got the job done for my 2d golfing game with some workarounds and I appreciate having a JS first physics simulation library, but it was a bit buggy even for some pretty simple scenarios. Doesn't seem like it's getting regular updates to the core physics anymore despite a lot of open issues and pull requests (although I do see two very minor git commits from this calendar year).