yeh i did check out, i have my ideas if you consider them-
1) the button play again, if you add the sound when clicking it , it would be geat,
2) at starting i dindnt notice that the heats are going down and the snake is poisoned then on the second run i noticed that, then i understood that i have to drink the potion to cure them. you can try changing the heal potion color to green or red. just experiment if it fits the game or not.
3) changing the sound of heal and shield , make the sound of shield long last till the shield ends. and healing sound like drinking potion just like mario,it would be awesome.
i liked the rings of the snake, feels like neon snake :D
visuals are great, the speed sound was not satisfying, you can try to experiment with different sounds and see if it fits or not.