Comment on: Show HN: M. C. Escher spiral in WebGL inspired by 3Blue1Brown

stupid question to webgl experts here?- can you build an entire fps shooter game using web gl? how is physics handled? how is collision detection, enemy AI handled? what kind of frame rate can you expect from a counter strike game made in web gl?- what is the difference between webgl and threejs and babylonjs?- what is the man hour effort involved for doing something like this assuming you know html, css and js pretty well but not familiar with gamedev- is open gl the non web version of web gl? or are they completely different?