Awesome game! I had a similar idea a few years ago fo a creature(like uncle Scrooge McDuck) going deeper and deeper into a mine looking for gold. With a lot of polish this could be a great mobile game. Good Job!
Well I called it a mine, but actually a hole in the ground or a cave is more correct. I am just a bit sleepy. But you get the idea, with a narrative and some polish you could go a long way :)