Vanar.io is a 2D multiplayer game in which you are a spaceship that shoots other spaceships. It is not a regular shooting game however. you only have a limited amount of shots before you run out of ammo in your arsenal.
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Kazap.io game is played with your spaceship floating through vaccuum of space. You utilize the arrow keys to move as you wish freely all around, however, you must be aware of your sorroundings as touching a wall will kill you.
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GoBattle.io is a 3D multiplayer gobattle game with extremely colorful graphics. The point of the game is to kill your opponents to become the ultimate king.