Really good stuff. The controls were intuitive. There was a real story to get things going and create tension. I like the concept. I like how the music changed when I fell in the pit. I like how you used the level design to create a sense of getting lost deeper in the cave. I like the style and the assets you used to create the atmosphere.
There is a glitch where the character gets lost and the screen freezes—it happens when you are trying to jump up from one stage and don't quite make it. Unfortunately you have to restart when this happens. (I would play it more to try to get to the ending but I am worried about the glitch, because it happened twice.)
Overall I thought this was really great!