This is one of my favorite proofs of concepts I've seen yet. Really creative take on the theme. I could see this becoming a very enjoyable full game, similar to something like Downwell.
I only wish the controls had a way to nudge in a direction. Not full on movement because I think that would ruin the vibe and controls, but if pressing a direction gave a slight boost in that direction it would go a long way for feel.
Great job!