While still early in development, all testers will notice that upon running Smiley Country today, the Dispatcher-made Updater will get you updated to the new version. This is only a minor update, fixing some bugs, and changing some parameters of how the forest dynamically grows. You will notice some features partially implemented, like currency. For more details, see the Devlog.
The next major release will include some economy basics, like the creation of money, and the buying and selling to/from buildings, and of course the feature where buildings can actually do things.
If you are just installing the game for the first time starting today, you will notice that you no longer need Admin rights to Install, Update, or (as before) Play the game. This is thanks to an optional feature of Dispatcher, which causes your Installers to use a Chrome-like install method to bypass the need for Admin rights. Enjoy procrastinating!
If you want to join the private alpha, just reply to this thread.