The background feels a bit too bright. I like the colorful look, but think it could use with being toned down slightly.
Overall, it felt like a decent snake game. The snake leaving a trail is neat, but it also made it difficult to be certain where the end of the snake was. It would help if you change the color of the trail a bit or did something else to give a bit more of a hard defining of where the snake ends.
It would also be nice if the game scaled up to better fill the browser window.