A lot has been completed, but much remains. I think the basic structure of the ships and weapons is done as well as gameplay logic, although some tweaking remains.
The primary reason I am posting this is because I don’t know if I will ever finish this due to far less time being available for projects like this. I hope that someone will run across this and decide to finish it. The code is licensed with the AGPL 3.0. Basically, I don’t care what you do with it as long as you release the code. And please comment below and link to it if you do finish this!
Go to GitHub to download the code and continue development!