Nice short game, took me about 40 minutes roughly to complete it.
The main issue I had with this game is the controls were super clunky, the character would jump on it's own when you collide with the rocks on the floor.
But other than the movement, the visuals and sound design were amazing.
Not sure if you're still working on the game or not but fixing up the movement mechanics would certainly help, and would easily be worth $5 or more.