no need to roll your own solution. If you want to ship a game, go high level :D
For web native rendering pixijs is good for 2d (and phaser is good also a good entry level). For 3d theres threejs/babylonjs.
There's also unity, which some browser games use but it has downsides on web (large build sizes for one)
None of the networking solutions will give you unreal engine netcode developer productivity (and that includes ones for unity). I use colyseus, it doesnt solve everything but will save you some work
Re saturation, it definitely depends on the genre, web is its own market. What type of game are you thinking of making?
For web native rendering pixijs is good for 2d (and phaser is good also a good entry level). For 3d theres threejs/babylonjs.
There's also unity, which some browser games use but it has downsides on web (large build sizes for one)
None of the networking solutions will give you unreal engine netcode developer productivity (and that includes ones for unity). I use colyseus, it doesnt solve everything but will save you some work
Re saturation, it definitely depends on the genre, web is its own market. What type of game are you thinking of making?