Warbot.io is a bit of an outlier among other .io games in that it features 3D graphics, providing great eye candy, but also slowing downloading times, especially for those without high-speed connections. 

Warbot is a top-down twin-stick style shooter, with the mouse cursor controlling your aim, while the WASD keys control your movement. Players march through the battlefield, engaging other mecha while dodging enemy fire, gathering powerups, and crawling up the leaderboard.