Super interesting concept! I like that you should keep your head on the snake not to lose energy but that you still have to take the risk of venturing out of the safe zone to eat!
Maybe I would've switched the snake and the background color, since red inspires danger as opposed to green which inspires safety (then again, that's just a detail).
Since your game is playable on browser couldn't you check "This file will be played on the browser" to make it directly playable on itch.io ?
Otherwise the difficulty was balanced (I never died unfairly but I also never survived indefinitely), I had fun !