This game...
I.. I can't believe it. I actually love this game. My absolute ONLY gripe is the fact that you can't pause it. Well, that, and the fact that the little ball Fail-Safe is kind of useless. The black holish Fail-Safe, I don't completely understand how it works, but I'm guessing the way it heals you is by absorbing enemy projectiles.
Graphics - 10/10: This game is fantastic to look at (except for the Awards screen, but those are boring to look at in every game ever made, so that is moot). The weapon animations are good, especially the laser.
Sound - 10/10: The music doesn't grate on your nerves, and that's a huge plus. The songs perfectly suit the game to the point that you actually look forward to the next one. All the weapons have good sound effects except for the Machinegun, but I don't think it actually HAS a sound effect - not that I really care, as you probably couldn't hear it over all the exploding enemies anyway.
Gameplay 10/10: Basically, you go around and blow stuff up - pretty much everything that gets in your way. Enemy ships, these weird top-like enemies, these strange little spikey balls... everything that isn't a wall of some kind.
Controls 9.5/10: I've only felt a little upset with controls when it wouldn't use a Fail-Safe when I wanted, but I'll blame that on the fact that I had what I call the "Full-Weapon Assault" Fail-Safe active, which kind of slows down the game, but not enough to impede on playability.
Difficulty 9.5/10: It's pretty easy to pick up and learn, and that's a good thing. My only TRUE complaint is that frankly, it's too short. Six levels is okay and all, but what about eight? Or ten? Or twelve? Length is sort of an issue, but you can still enjoy the game regardless.
Overall - 10/10: Keep up the great work! I rarely give anything a perfect score, but this is definitely deserving! So here's a recap of what should be improved: length. Add more levels. Aside from that, this is perfect.