Maybe since it doesn't work as a very fast racing game like Wikepout, you could add in some side objective. For example since it's easy to smash into buildings you could make the game about delivering goods and make the player focus on driving as fast as possible without damaging the vehicle/goods,
To me this demo's best thing is the immersion rather than racing, maybe you could try to add some driving/flying simulation mechanics to make it more about the experience of operating the ship