Ok I reinstalled itch client and it worked.
Very neat-- One of our artists/designers actually had a similar idea for our game where when you landed a jump it would create sound waves that would outline the solids in the level. Thanks for including the course code by the way.\
I really liked the simple style and game play-- I also liked that the walls of the cave were not just blocks they were curved which could lead to some interesting secret cavern scenarios. My only complaint is I wish there was more OR just one more mechanic to really push it over the edge. Maybe the female bat makes a noise as you get closer to her?
Overall though, very good work and fits with the theme!