@mdotedot oh I understand your concern. I should've added more details on how to run official examples with server build with haxe. So, in order to run those examples you will need to checkout colyseus examples in your projects folder and bundle colyseus client lib:
git clone https://github.com/colyseus/colyseus-examples.git
cd colyseus-examples
npm install
npm run bundle-colyseus-client
Now things are going to be bit complicated since you will need to configure and run your http server to serve client static bundle.
There are multiple options how you can do this, I would recommend nginx server as you can install and run this server as local host, and it's easy to configure as well! Once you start serving those examples you can run the server and verify that clients and server are actually talking. Just make sure that port is the same for client and server and you're good. Let me know if I can help with anything.
Oh and I didn't verify how official haxe client works with latest official server as this is bit out of scope of my current task ;) This is why I created externs for js client as well, because this makes sure that client and server are up to date and compliment each other.