I'm kind of sensitive to eyestrain in some games, and this one did me in pretty quickly. Sometimes I can't really pinpoint it, but I think it was pretty clear this time around. The scrolling background is extremely busy visually, scrolls very fast, and stutters slightly on my machine. Enemies don't have enough contrast and are very hard to pick out against the background, which doesn't help either.
I liked the music, the title screen was nice, and the mechanics seemed to be competent. I wish I could offer more feedback but I had to exit out pretty quickly.