So NicolasGatien already pointed out what I think was done perfectly in that the game starts out with you eating your tail to show you "this is what you want to be doing". Great way to demonstrate to someone the goal given usually in Snake you DON'T want to hit your body. I also like the added challenge that if you don't hit the tip of your tail the score seems to be counted based on the segments after you hit your body.
I think maybe the rate of obstacles was a bit fast sometimes, it could be easy to have a fruit just spawn in the middle of obstacles and there was not much you could do about it. Not sure how you'd tweak this though I think it's just a given based on the challenge needed in a game of Snake where you want to hit yourself. Also dunno if it's intentional that you can clear obstacles before they spawn by running over the warning with the snake?
Nice work overall.