This is our first time doing this in s&box, and we need to build a bunch of backend systems for it. So consider this a dress rehearsal with live ammo. This is something we want to start doing a few times a year, so lets all be friends and encourage each other, and we'll do it more.
Our intention here is to create playable content to show the new engine off. This is why we didn't add restriction on theme or anything.. because we want a different variety of games rather than a bunch of Valentine themed games, etc.
We're still closed alpha. Don't worry though - we will be releasing more invite keys over the next few weeks, so you might still get a chance to join.