Creating a 2D Maze

Hi, I'm trying to create a 2D top-down maze game, where the player drags a snake-like sprite around a maze with curved walls. My main question is regarding colliders.

The best way I can think of to make the maze itself is to create a sprite with the maze paths cut out of it, and then use a polygon collider to define the walls. In order to get the snake sprite to move smoothly, at the moment I've applied a circle collider to each segment of the snake sprite. The segments are then linked together with hinge joints, and have a low friction texture on them so that they move smoothly around the maze.

This seems like a bit of a crappy solution to me and I was wondering if there's a way to avoid using colliders for the maze altogether. Is there any way to draw a curved line that would act as a path for the player to drag the snake along - one that the sprite won't be able to deviate from? If this was the case I wouldn't have to worry about snagging or complex polygon colliders for the maze.

Hope that makes sense, thanks.