The Unity issue is resolved, and I was able to export builds for Mac and Linux. All builds are available for the most recent update. Unfortunately, Unity plans to discontinue Web Player support in favor of WebGL, but I have been unable to get the game to work on a WebGL build. As a result, there probably won’t be an in-browser version of the game in future builds. Also, for people who are having trouble figuring out all the controls and ships, the next update will probably include a tutorial.