동굴 컨셉이라면 Dear Esther를 빼 놓을수 없죠. 꼭 찾아보세요 :)
https://www.google.com/search?q=dear+esther&source=lnms&tbm=isch&sa=X&ei=Yb5VUo3LJuOyiQKD9oGwBQ&sqi=2&ved=0CAcQ_AUoAQ&biw=1920&bih=1080&dpr=1