Fun concept! Some notes, if you don’t mind?:
When the snake crashes into itself there’s no alert, no indicator, you just instantly get sent back to the start, quite jarring. In the future, I’d recommend adding some kind of animation to show the player their death! Like a huge explosion or something of that nature.
Also, why doesn’t the ball bounce against the top, right, or left sides of the snake? During the portal level, I tried boxing the way to the check with my snake, only to see that ball just straight up flied through. Very strange!
Other than that, it’s a good game! Nice job.