Even back in 1986 Nintendo was opening up Metroid for a sequel. It's also kind of strange/fun to see a Nintendo game talk about praying for peace. Who does Samus pray to for peace and what is her belief system? I tried to do some searching to find out and it seems the Metroid Wiki doesn't seem to know either because talking about the Galactic Federation in the Metroidverse they say:
"The specifics of culture, religion, trade, currency, technology, civil rights/liberties, and so on are also unknown."
...

I think "pray" in this case may not necessarily be a literal prayer to a deity, but a very strong hope.
Great game. Do you ever plan on revisiting it?
Justin Bailey
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I think I would come back to play it again to see if I could get the best ending.