Thank you! The music came from a composer called Sirkoto51 on FreeSound, I just thought it was too good not to use (and didn't have time in the jam to compose myself haha). I definitely thought about the idea of decreasing health when ships got past but you are right that it made the difficulty curve go way up so I ended up scrapping it. I might revisit it eventually though and play with ships going past either giving a penalty to health or score. Thanks for playing!