Awesome game, bad controls.
This was a sweet game! You merged the concept of asteroids and defense games with great results! Good job! =D
There was one thing I that could be improved upon though. It seemed that the controls were hard to handle. The slightest tap of the up arrow button would send my spaceship careening at warp speed toward the other side of the screen. This wouldn't be that bad, but there is no reverse, so often times I found myself just traveling in circles just attempting to stop. I say if you're going to make a sequel, then either put in reverse or reduce the speed of your thrust.
Other than that, awesome job =D