This one's hard to rate because like you said, it really is more a proof of concept than a full scale game. What is there is quite impressive because I'm guessing there was a lot of physics involved in designing the ship movement, and I can definitely see something like this being turned into an interesting game in the future, but unfortunately there just isn't quite enough to it "as is". A multiplayer spaceship shooting game with these kinds of mechanics would probably be pretty interesting though!