If you don't think this game is that good, I don't know what's good for you. Man, if you removed any 18+ content I would still play it. It reminds me of classic platform games and I always liked mining games.
In relation to the potential I mentioned, you could add Greek or Egyptian structures and creatures (Like the minotaur or Anubis) or even something with dinosaurs (From the paleontology side). I think I'm already exaggerating lmao.
But I understand your side, I just ask that you don't underestimate this game too much, because it's excellent and deserves more Love.