That is some very loud music you've chosen for your game. It's got a head bobbing beat, which is great. If only the gameplay was more fast paced, then it would be more fitting.
I do like the graphics; the ship, rocks and metal have a nice polished look to them. I found it interesting that the arrow keys were used to steer the ship rather than to move it in the direction pressed. This does add an extra challenge, and I think the balance of the asteroids was good considering how difficult it is to control the ship and how limited the range is.
The only real major issue I have with the game is the steering is too finicky. A light tap with the left or right arrow keys can cause the ship to rotate quite a large amount that prevents it from being able to aim properly at its targets. The shooting could definitely use some longer range too. I do, however, love the fact that you can hold and shoot. It saves my fingers some strain. :P