Well done! Very solid concept! You could easily make this into a more complex game by introducing dangerous elements (like a black hole, asteroids, ships) to make this even more challenging. The music really adds to the experience as well. It's a little frustrating at first because I expected the ship to stop firing thrust when I let go. Once I figured out how the ship operated, I was doing much better. You could also add a fuel gauge if you want players to really watch how much thrust they use.