There are definitely some good ideas here, the only concern I have is that this presents it as though goblins have only one very specific habitat and set their lairs up only in one very specific way. Not even an indication that these are <adjective> goblins it is talking about-- so any idea of subraces is undercut from the very beginning.
It is saying that Goblins cannot live on tropical islands in huts mostly fishing and gathering fruits from the trees, but killing and eating anyone who comes to their island. Or on icy tundras, nomadic on the pack of their wolves as they hunt game and dig up whatever they can from the frost. Or have a particularly wild and savage tribe that heavily utilizes animals to do their labor and wield nature magics. Or live in the crust of an active volcano, adapted to the high heats and specializing in using minerals and metal-working. Or deep in the underdark as albino sightless creatures that get around by their sense of sound and smell and survive by eating mushrooms and anything they can take down by using numbers and pack tactics. Or as denizens of the feywild infused with unstable magical energies that cause them to mutate in odd ways so that no two look alike and living in hidden burrows. Or traveling the deserts as night-worshiping nomads with various adaptations that allow them to thrive in sandstorms and thus ambush people within them. Or sewer dwelling city underclass that live by lurking around at night and stealing whatever they can get their hands on, collecting whatever might be useful and dreaming of over-throwing the city they live beneath.
Maybe it would still allow for the random mutated blue-skinned one that pops up with psychic powers.
Because it applies adjective-less "goblin" specifically to the forest-dwelling miner variety, it doesn't leave room for all the myriad other ideas for goblin tribes with their own special adaptations and lifestyles that could be occupying radically different environments of the same world. Clearly the same sort of creature, but with slight adaptations and quite different cultures.
