MVP skeleton for browser based MMO game

Need to write a MVP skeleton for browser based MMO game.

Server side - node.js and web sockets
Browser based frontend - Svelte and WebGL2

Ability to connect multiple players and see them walking around.
Flat map, minimalistic player object (3d kube or something) moving around, no much work for graphic desiner atm.
Focus on test automation - i would like to be able to predict max player count per server/map, and once we develop more heavy features the impact on system components.


I need to put together some fundamentals, like connection from frontend to backend and multiple users interracting with environment throught hte server ;)

This is a basic description of what i am thinking about - no fancy stuff, in case i am missing something we will add it once we finalize work plan.

Browser based frontend - Svelte [UI] and WebGL (Canvas)
1st page - Sign in button
Login with Google - once pressed - user is created and stored in backend DB
2nd page - available after login
Character list - currently hardcoded - only 1 option available
Button - Enter World
3rd page - 3D world, WASD movement, SPACE jumps, Mouse right rotates screen, Mouse scroll zooms in and out
Character placed in 3D world
Player Character and other character locations loaded from server

Server side - node.js and web sockets
API described using Swagger Tools
user create/login section
user characters section
server world logged in characters and their coordinates

Testing
connect multiple frontends to one server
move characters - observe movement from other characters
ability to use test automation to call url that adds new player to map with hardcoded circular or random movement - purpose colect backend-fronend interraction metrics
example.frontent.url/automation-test-player/[custom-id:from:1:to:99999],[time-online-seconds:from:1:to:99999]