Unity Technologies is shaping a booming global games market. The Unity engine is far and away the dominant global game development software. More games are made with Unity than with any other game technology! And guess what? Unity uses OpenNebula to run their IaaS infrastructure to support their development services, among other things.
More details in the OpenNebula Blog
We look forward to knowing more details about your infrastructure. Just let us know if you want to write about your deployment.