They are all really charming games. If you’re into cute things and some excellent humor, definitely play all of them. The first one is pretty grim actually and you need to move fast to finish the game without dying. The second one has some really tough caves, the third is just cute and has these great side missions that are worth the time. What I’ve been reading about the fourth episode it looks like it’s going to be the best of the bunch. They’ve been making the games better iteratively, and the idea is quite novel it’s worth to play them all if you like one of them.
I wish Miyamoto gets his success finally with the fourth episode, they are so adorable.