First playable build is now up on my site:http://sansumbrella.com/things/lure/
The worm is controlled by keyboard-mashing, with the 30 keys in "home row" and the rows above and below it mapped left-to-right along the body and vertically above and below the body. So "zxcvbnm,./" all push the worm up at different points along the body and "qwertyuiop" all push it down along the body. "asdfghjkl;" generally pushes upward, but the force is a bit randomized; they always map left-to-right to actual segments, though.
I'm going to put a few more hours into this tomorrow so you can get eaten and have some closure.
Fixes so input works in processing.js
Get eaten by fish
Make fish gradually gain interest and attack
Give some feedback when you drown in addition to turning purple and having no control
Give a score: how long you survived * the size of fish that ate you