Good take on an asteroids type game and obviously hits the secondary theme well.
I liked the look, but I did notice that it's not exactly pixels. The sprites are pixelated, but the movement is not. Not a huge deal as I'm not even sure I got that right and was hard to get things pixel perfect.
Would have been nice to have some music, but I didn't even get that far. Also maybe sounds when the asteroids were hit.
Only "major" issue I see is that it's a bit too easy to cheese the game, especially when you get the item that allows you to shoot out 3 shots at a time. Once you had that all you had to do is sit there and hold down the fire and rotate and you could go on forever. Not sure what you'd do to make that part harder, but at least maybe start to make the asteroids move quicker once above a certain score, or maybe only allow a certain number of shots over time?