Did you like it?
No worries. Octopus is okey dokey!
Just don’t eat too much of the shell fish like crabs and lobsters as per Jewish traditions.
As the other bro said, there is no specific tradition in Islam that forbids a particular sea creature from getting consumed.
Since most of the early Islam evolved in the desert, it doesn’t have clear wording about sea food.
So do what I do. eat it when you see it.