Agar.io
Freemium
Agario is a fun addicting MMO game in which player have to eat or be eaten while you strive to dominate the World of colorful cells.
Agar.io Clone
Open Source
Agar.io Clone is a clone of the agar.io game that uses a quadtree for collision testing and canvas layering.
Osmos
Commercial
Osmos is a puzzle video game.
Compare Nebulous with alternatives
Compare Agar.io Clone and Nebulous and decide which is most suitable for you.