I like seeing how small design choices leads to these different experiences and think this ouroboros sub-theme interpretation is a good showing of how detailed game design can get and impact player experience.
For your game, I liked how it seemed like the snake was coming from a pipe /tunnel. It was unclear why the player would want to get the other runes as if I wanted to clear the level I just needed the green ones although I admit I only played a few levels.
Just a hint the snake in this game moves in block increments, so you can choose to stop at a certain point and it should stop. I think I wanted to add a "skill" element to the game but I see this game could have been fun without it.