This was fun to play around with but it was a little confusing to understand what I needed to do outside of avoiding the snake. It wasn't immediately clear what certain pickups did so there could be improvements with visual feedback. It didn't really implement the theme. I would usually accept a literal interpretation of a snake/dragon eating its tail or a metaphorical one of an endless cycle, but the only thing related to the theme here was that it had a snake. Nice music though.
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I realized after submitting that the objective of the game would be a little confusing to new players. The snake does eat its own tail, but the player has to guide the snake into doing so. When the snake eats a rabbit it grows, and when it loops around in a circle you can see how much it should grow for it to complete Ouroboros.
Hope this helps and thanks for playing :)