I think this is pretty good for a tech demo! The concept is cool, and I can definitely imagine a full game using the snap mechanic well. The monochrome art style fits really well with the idea of only "seeing" things through echolocation, and the minimalistic sound gives a good atmosphere. The main criticism here is just how little there is to the game; in a full game, it would be cool if there were some mechanics which take advantage of the fact that your character is blind, like noise sources which effectively blind you due to an excess of sound. Also, while I appreciated the note that the letters were originally in braille, it was probably unnecessary to put it at the end of all the notes; I assumed as much after the first one. Other than that, looking forward to seeing if this gets a fully realized version down the line!