A free program for Android, by Kimochi.

The gameplay of SnakeAttack.io is very simple. It is all about getting as close as possible to your opponents without getting shot by opponents or getting hit by environmental factors. 

You need to make sure that your snake is large enough to strike down other snakes before they get a chance to strike back. The larger your snake, the more damage you can inflict. You will also have to consider the amount of space you have on the field, as well as the amount of time you have to play.

If you ever get shot or hit by an environmental factor, you will lose the game.