In Space.io, destroy anything in your path to grow your fleet, and then show your enemies that you are the king of the space world.
Simple: move and shoot. For every object you destroy, either enemy ships or neutral orbs, your fleet gains a ship. From there, it's just a matter of having the biggest fleet of the galaxy.
Duck and weave! Projectiles move slowly, so they're easy to dodge and avoid. And, of course, avoid any enemies that are much bigger than you.