what I think will be good is:
more kinds of fish
more weapons (bow would be a good one)
add birds maybeand the last one I think will be good is or an island in the island there will be maybe animals (like cows) which you can breed and also hostile animals (boar,bear,wolf) will be some great examples. the axe will be more useful there for chopping down trees. and my favorite idea, add canibals or wild people in the island.
thanks for reading!!! I love your game developer but I think at least one of these small changes will change this game for good and it will be more fun to play.