The sound waves could need more speed. I like the whole idea in general. I wish there is a short description of our objective/goal here. I was just wandering around and later find out I am supposed to go downwards. Just put "Go downwards until you reach the finish line" (if there is) in the game page would help clear this up. Thanks. Anyway, I got 4 losing endings, the last one is probably when I reach the goal.
If you want to expand this, maybe add some hidden items around the map that can improve sound waves and cooldown of circular sound waves. Maybe some items that has tragic story as well to add up to horror-like vibe.