This is the expected behavior, since the
www tool is not started as a daemon. If you want to see more output, just start it in the following way:
You will see that the default port is 3000, so you will be able to access it via: http://YOUR_IP:3000/
Don't forget that before executing the
www tool you have to execute
npm install in the directory.
Note that in order to be able to access that port remotely, you will have to open it in the Google Cloud console. We have documented that here: https://wiki.bitnami.com/Google_Cloud_Platform/Servers#How_to_open_the_server_ports_for_remote_access.3f
I hope it helps!