Haha, I noticed the resemblance when putting together the cover art. The glowsticks I'm used to have hooks on them, and for some reason I thought the best look for it was to leave out the hook. So that's how that came about. I agree about the bullet speed, and had wanted to implement Yellow glowsticks as bullet firing rate/speed boosts, but never got around to it. As for sounds, the ones I found, I think, would've annoyed the crap out of the player. So I just left them out.
I really appreciate the feedback, and thanks for playing!