[Complete][Free][Android] Canyon - Top down space shooter

Hi all, This is my first released game, I would be grateful for any feedback.

• Fly up the canyon dodging and shooting falling rocks using touch to thrust and shoot; tilt to rotate/strafe.
• Indicators on the right show your rank in the top 20 for longest flight without hitting something and total distance flown (assuming you log in).
• Higher difficulties are closer to "realistic simulation", hard gives free rotation of your ship and all the flying into walls that entails.

Canyon Android

• Uses LibGDX deep under the covers.
• Textures are my own (I am particularly pleased by the rotation dependant animation on the ship :D )
• Sounds generated using JFXR.