I decided to revisit this game.
This time, the downloaded zip file with the update was where the game said it would be. Possible UAC interference last time?
The BGT file I saw last time never showed up, or maybe it was a temporary file that hadn't been deleted? No clue, and not going to worry about it..
I noticed in your readme file that the only supported screen reader is NVDA and SAPI. Really? I'd call that a slap in the face to users of every other screen reader and is rather close minded. Especially when you consider that it might actually work with other screen readers by simply setting SAPI as the default.
Other screen reader users could switch off SAPI if they want to try it with their screen reader. As stated in the readme, the game becomes unresponsive when JAWS is running, but with very little work that most JAWS users will already know how to do, it could be made to work. First the game needs to be set to use SAPI from outside the game, better yet you could distribute the game already set up to use SAPI. Then all JAWS users would have to do is create application settings for the game and enable suspend mode.
So the problem now is how to configure the game to use SAPI from outside the game.