Nice game and cool art, audio is glitchy but you've adressed that already. It is kinda hard to tell where to go because of the darkness, but I understand thats part of the game.
Sound would be nice, but nice graphics and a cool concept. I think the physics are a bit weird, but if it was a longer game I'd probably get used to it after a bit.
Some changes to the opening, like maybe adding visuals and changing the way the text is presented (in a fixed spot on the screen, and possibly a different font).
I didn't get past level one, but from the text in the beginning I think I know how you were going to incorperate the theme.
During the level, the background was a bit much stillbetter than leaving it blank though. Also making it so that you can hold down the left mouse button to rapid fire would be nice, but that might just be me because my mouse makes loud clicking noises.
