thanks! I had that concern too. The original idea was to create a line through the Serpent to kill it.
But it wasn't working, and I just got frustrated. And quit that part. (Only way to get the game finished!)
But. I did manage to get that part to work for the next game in the 20 second game jam.
Once this game finishes (depending on rating) I may update it so u can draw a pad across the Serpent to kill it.