The interface is very nicely presented, with rather lush 2D graphics. When you quit the game, you are asked whether you want to save, and you can also save any time you wish to during the game.
Navigating ET is easy to do once you understand how to, but the various mouse cursors that are available are only subtly different, so sometimes it's unclear how to solve a given puzzle. For example, when attempting to get an umbrella from the family dog, the mouse cursor seems to change form and you would think it would allow you to click on the dog and retrieve the item. But doing so does not result in any action taking place, and getting the umbrella requires a completely different strategy.
As mentioned before, ETPHA is a standard adventure game in most respects. Though geared for children, adults enamored with the adorable alien might also enjoy it. Although this reviewer didn't find the game enjoyable, hopefully kids and teens will find the game less boring, and more satisfying.