Nice short game with a good difficulty curve, and a lot of visual charm! I loved how the ouroboros eats itself and folded up and the smile on its face. I was really surprised on the level pictured that it actually reacted to the wall when it eat!
The one piece of advice I have for you is in the future when you're making your games, try to get sound effects in early even if they're just placeholder beeps and will be replaced later. As you're making a feature if you feel like eventually a sound would go here throw a generic sound in asap. Sound is the biggest bang for your buck when it comes to game feel and is the one thing that will improve how fun your game is the most. A generic sound that isn't perfect is often better than no sound at all, and adding placeholder sounds to be replaced later is much easier to do than trying to totally go back and do all sound implementation at once.
Awesome job!