So cute! Loved the theme, very unique, and very awesome!
Some things I suggest: Try enlarging the hitbox of the snake. Sometimes, I felt like I hit the snake, but my hit wouldn't register. The movement and camera controls can sometimes feel a little awkward as well. I also didn't even know about the health packs until later; you can make them clearer with something like an outline.
Nonetheless, this is an awesome and unique game! :)