Everything is pretty intuitive. There is a settings button where you can change up a few things, including snake color, snake type, sound effects, etc. You can also switch the buttons in settings for mobile accommodations. There are a few different fruits- The apple is normal. The fruit salad gives you 3 points. The watermelon gives you 5 points as well as a few seconds of invincibility. Once you fill up the board, your size resets but you keep your score, allowing you to continue forever. Have fun!
Thank you to Griffpatch obviously for the score counter! I believe everything else is by me.