Hawaiians believe that the first animal on the planet was an octopus which is part of an alien race, and all life came from that.
While I agree with your general statement, the most common Hawaiian creation myths involves the four principal Hawaiian deities - Kane, Kanaloa, Lono, and Ku. Specifically the god Kane and/or Kanaloa, in a creator-deity fashion.
While I am not a Hawaiian studies major, I've taken my fair share of Hawaiiana classes, and I've never heard of the octopus being anything other than a family spirit or representative of a minor god - maybe Kanaloa, god of the sea.
I'm interested as to where you garnered this information. Perhaps it is another polynesian culture's creation belief?
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