The Alpha test is well under way, about 50 people have played and quite a few left me feedback.  Lessons learned:

• Don’t leave things in the game you don’t want people to see yet even if you think it’s inaccessible.  I limited the alpha to the first half of the game, but due to a collision glitch players were able to run around and see how the sausage is made, including blocked off areas.  Oops.
• Apparently PrintScreen doesn’t work in fullscreen, you have to roll your own
• Several European languages use a comma instead of period for decimals, and a bunch of convenient C# functions are local culture dependent by default

Thankfully I spent some effort ahead of time making it easy to get error information when there’s a crash, that has helped a ton in fixing issues that only happen remotely.