Geometry Dash is a 2013 mobile game and Steam game developed by Sweden-based developer Robert Topala (RubRub), and published by his own company RobTop Games. It is a rhythm-based running game which currently has 20 levels. Geometry Dash on Steam (3,99€)
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Agar.io is a massively multiplayer action game created by Matheus Valadares. Players control a cell in a map representing a petri dish; the goal is to gain as much mass as possible by swallowing smaller cells without being swallowed by bigger ones.
We've got only one video of Plague Inc.:
Plague Inc. is an iOS, Android and Windows Phone strategy video game, developed by one-man developer Ndemic Creations. The player creates and evolves a pathogen in an effort to destroy the world with a deadly plague. The game uses an epidemic model with a complex and realistic set of variables to simulate the spread and severity of the plague.