Unity 3D,game created for windows
To play your game online, like so( 1), all you need to do is have a file sharing website, like Dropbox, and upload your files. You game will have to have multiplayer support for others to play, however. Be sure to export as a WebPlayer, not as a Unity Standalone.
Another solution is to export as a Standalone and upload to Dropbox, and have others download it.