I just found today on google play a very nice game very similar with agar.io. This game is named “Dot Eater” and can be downloaded from here. A few info about Dot Eater from their official documentation:
[HOW TO PLAY]
– Eat little dots and candies
– Avoid bigger dots
– Try to create the biggest dot possible
In this update: new bumpers, new io game and better ui, improved performance!
– Audio switch
– Autorotation switch
– Enable virtual Split button
– Enable virtual Joypad
Coming soon: new game elements.