Earthbound is the single greatest RPG I have ever played, and yes that includes M~Wind. I've been RPG-in' since I was 12, and Earthbound popped my proverbial "cherry" as it was. In short, it is an amazing game with no shortage of unique features and memorable moments.
First of all, the game focuses on humor. Light-hearted jokes abound through the entire game, whether it's simple slapstick to bodily functions. It is a huge game too, with no time counter it's hard to estimate though.
It's a very good game set in a modern, early-90's world. Aliens, zombies, bullies, robots, and many other zany creatures will be your enemies. Truly awesome game, I thought I was the only one that even knew about it. If you ever see it anywhere, try it, you'll love it.
GSP sez...Words 4 Bush