Looks great! Since you're not planning to do anything with it further, are you willing to make it open-source for others to build upon it?
I think the flight model I probably will at some point, since I really like it and is so self-contained it's ported pretty much 1:1 from its test project. Pretty much all the other mechanical parts of the game, such as the weapons, are sourced almost verbatim from my own GitHub.
The game as a whole actually feels like a decent start for a future (if simple) product, so I'm hesitant to just open source the entire thing. People would also have to purchase Shapes (which I highly recommend either way), since this game makes heavy use of it.
That said, I know people have done some pretty wild things with reverse engineering and hacking stuff into Unity games recently. As long as they don't profit off it, I have no qualms with sufficiently motivated people doing that and expanding the game that way.