I have played Slither.IO a lot as E=MC2. I really like the game, and you can get it on the Apple Store and play it online at http://slither.io.com. It is really cool, and I have some tips for getting up into the #10 leaderboard:
Always keep away from big boys until you are one yourself.
Try to crash into others' heads with your body, not YOUR head. You'll die that way!
Slither, which helps keep your head safe.
Circle smaller players and constrict them. Keep your head on your body as you circle and enclose them.
Try to get the little circles on the floor.
Enjoy the game!