MEH...
controls were good, coding was good, and the idea was good... it just wasnt implemented properly... Basicaly, there isnt enough to this game to warrant a good score. Make each level upgrade after a larger score, and put a level complete at the end of each level, where you can upgrade the weapons movement shielding auto turrets etc of the craft, and put in stronger meteorites aliens as the rounds increase. BUT, dont just do that, put in something original as well to boot, such as a story or something.
Also have each thing spawn outside of the stage, by level 10 in your version, the meteors spawn about 20 pixels above the craft, which isnt enough time to click.
SO... come back in a few weeks with an updated version, and im sure you'l be able to get a score of above 3.5