Junon.io

Junon.io is a co-op space station survival game with a mission to build and defend your colony against the evil Empire. You start off by mining asteroids for ores, and you also need to maintain a supply of food, water, oxygen, fuel, and power to survive. Eventually, you will be able to automate production systems from farming, butchering corpses, to refilling turret ammo. Love co-op game like this? Check out Dredark.