ShootEm.io, a multiplayer shooter game, is fun and exciting. You must navigate a 2D pixelated area and eliminate your enemies. You can move your character using the WASD and arrow keys. To aim and fire your weapon, use your mouse and left click mouse button. To start, you will need a pistol. You can also find other weapons in the city or in crates.ShootEm.io, a multiplayer shooter game, is fun and exciting. You must navigate a 2D pixelated area and eliminate your enemies. You can move your character using the WASD and arrow keys. To aim and fire your weapon, use your mouse and left click mouse button. To start, you will need a pistol. You can also find other weapons in the city or in crates.