I am in love with artwork in the game and think it has potential to be a great adventure game.
Something where you have lots of caverns to explore, each with it own perils to navigate(for example you could have areas full of snow or ice that make getting around more dangerous) , and perhaps resources for you to collect and carry back to camp to upgrade your tools( The ability to have longer ropes, carry more flares
have a Gas mask to go through certain areas, or different tools that work better in certain terrain)
I would love something in this art style that just lets you freely explore caves and mountains and figure out your own way to get around