Pretty good game
This was nice because it was just such a freaking easy game to understand! All you had to do was fly around as much as you wanted and shoot everything in sight! My biggest complaint is that there could have been some more detail. I was thinking there wouldn't be any difference in the level, but the designs of the enemy ships are different! The coolest thing was all the freedom even if you did not have much control. I suggest you put in some more of a background next time.
Overall, it's still good because it shows how much fun you can have with something so simple. This is what made the early arcade games classic. While not as good as those, it seems like you really had those games in mind. The "Game Over" screen is also really cool too. It took me awhile to notice the score in the upper right hand corner.