It has already been said, but the backtracking onto your own tail does feel a bit unfair.

Otherwise, I do like the music and the feedbacks and the visuals, albeit simple. Indeed indeed, nice clone of the old snake game.

The song is catchy! I also love the spawn animation of the apples. I feel the overall presentation could be better, but it is indeed a solid clone of the classic.

Pretty accurate in comparison to the original, good job.

The only thing for me that felt a little unfair is that you could actually backtrack and hit yourself directly. Normally I think you're just not allowed to go in the opposite direction the player is currently going. Have it setup that way seems a little more fair to the player.