Loomen.io is a game that is very similar to the smash-hit agar.io. You play as a glowing orb (cell, in agar.io terms), and you try to eat as many other small orbs as you can. The larger you grow, the more enemies you can eat.
Playing Loomen is very similar to how you would play other games like agar.io. You use your cursor to guide your player, and you eat the small orbs.
Just as you would in any agar.io type games, you want to try to avoid the big players in the beginning, and focus on eating the small orbs to grow. Once you gain in size, you can then begin to focus on taking out the larger enemies.