StickBattle.io is a 2D action game that you can play online. You will be fighting with stick figures.
It will put you in a ring with warriors from all over the world. Of course, the goal is to kill as many of them as you can. There is an ad at the beginning that you will get your gun if you don't watch it. You have to fight with your hands and feet until the gun comes. Pick up a gun as soon as they appear, because you will die soon without one.
Always make sure that attack and defense are equal. Don't attack too much without also making your defenders stronger. Find out what each unit does well and not so well so you can make a winning plan. Make use of mining to get the materials that you need.
Have fun and good luck!