Its a pretty nice snake game! The music is nice and goes well with the game.
The controls aren't explained at all in game which doesn't really let people play properly. Its not a good habit to get used to explaining the controls on the game page rather than in the game itself since if you make a downloadable copy, people could install it and have no access to the controls.
The high contrast background is also very difficult to look at. Typically when you have two highly contrasting colors together it makes people want to look at that area. This tends to be a bad thing when you're talking about the background since you want people to focus on the actual game objects instead. You could implement the two darker shades in the background and then make objects in the foreground lighter colors (possibly also giving them an outline to really differentiate them)