Pretty good physics there! I really like your implementation of the physics system for the ship, it makes it feel like a real spaceship.
At first is somewhat hard, but once you dominate the controls and understand well the mechanics it becomes really fun to play and explore! If this game is expanded with more complex level design and difficulty progression it would be even better. I'm happy I tried your game. :D
Good job!
PS. The music is nice and relaxing :)