An interesting prototype.
It's still very early, but I think the most pressing issue at the moment is the lack of navigation tools. Without them it's very difficult to tell where you are, where you are going, and how fast.
This would also help sell the concept more since you can walk around in the cockpit and all.
Also, consider only playing music during combat because any song, no matter how good, will become grating given enough time.
Keep up the good work.