We've created a multiplayer snake game where you can train your skill in such type of games. It has higher speed to be more attractive and there is also possibilities to buy extra lives, so you can continue to play without interruption and enhance your skills.
Built Serpents.win as Slither.io with lives — crash, lose 30% mass, keep going.
Multiplayer in browser, works on mobile. No install needed.
Try it at serpents.win — would love feedback, especially on phones!