I plan to build a very basic 2D game in html5: it's purely a map divided in 2D equal square tiles. A player can click on a tile to see the message "behind" a tile. Once open, other players can't open it anymore.
So there are no teams, no physics, no complexe player moves just the need to be massively multiplayer and cross platform (it needs to be playable on computer but also mobile so touch is needed for example).
thanks for your help, Mathieu