I was nervous about the parser experience, because I generally end up frustrated (sometimes to tears) within minutes. My brain doesn't work that way, and doesn't want to learn.
This was literally the only parser game I've ever enjoyed from beginning to end - mainly due to the very friendly walkthrough (which I consulted at every single step, after a few attempts at doing stuff on my own).
It's a fantastic game for true beginners, and works well as a teaching tool (my attempts at other parser games now last twice as long before I quit) without being even a tiny bit patronising, or breaking away from the story.
A downside in terms of personal taste is that the nautilus is (as you may have guessed) not human. It feels fairly human in personality, but I just don't relate to the epic and impersonal goal.
I was able to just barely understand (for the very first time) why people like puzzles in a story, even though I don't personally like them. Really grateful for the whole experience. It changed the way I see parser games.
If you love parser games and you're trying to convert a n00b, start here.
If you like parser but don't feel like staying awake trying to figure out a nightmarishly difficult puzzle... this game is for you, too.