Very nice game.
I can honestly say I haven't seen anything like it. At first I underestimated the game a bit because of the simple graphics, but it turned out to be a lot of fun.
There is only one major problem with this game: I want moar!
It would be nice to have different worlds or something, and maybe some kind of boss(es).
Having different places/lengths for the snake might be useful for creating more levels.
I know you are able to walk back to the snake everytime, but for paranoia's sake I would have liked to see a reset level button.
The music was great, it didn't get repetitive and fit the game.
Very good, I hope to see more.