Austin and I have been working on the server issues.
With the help of our great community we have been able to find multiple bottle necks that we did not detect during our Alpha Test stage.

We have done updates to the client (you now need to select which server to connect to first rather than auto select US server) and a lot of adjustments on the server to improve performance.

Unfortunately, we are regretfully not fully there yet when it comes to having hundreds or even thousands of people online. We are continuing to work on this issue, but for now we have put a temporary "fix" in that will allow players to play.

In order to allow the servers to be up, we have put limitations on the server population. If the server is full, you will get an error message that says "Oh no! We are currently doing maintenance, please try again soon.". We are aware that this isn't the most informative message, but the fix is temporary so we did not want to put too much time into fixing it.

We will keep you updated on the progress.
Thank you for your understanding, we're sorry that the Early Access did not go smoother.