Thank you for the feedback.
I had encountered the music issue once before, and I had thought I fixed it because I couldn't replicate the issue. And testing involved just listening to the song all the way through multiple times, so it was a bit hard to do.
I like the idea of putting the simple signs button next to the first level's signs too because the title sign is a lot easier to read than the others which have smaller text.
I do think that the parasite could use a slight recoloring. I spent quite a while trying to find a color that I liked that didn't blend in too much because I wanted it to be a darker color. I thought that the color I settled with, coupled with the light that comes from the parasite might be good. But I'll probably look into it if I come back to this project and make changes.