Can't add much more than echo what others have already said. Pretty fun game, the sounds that are there were nice and the sonar system seemed to work though the game is definitely not easy. I would definitely appreciate some keyboard controls. It's not a bad idea to have mouse controls for audio games, plenty of genres benefit from them, but very often I don't even have a mouse connected to my desktop. I ended up using a gamepad to simulate one to play, so if you're designing for blind accessibility it's a good idea to have mouse controls as one of the options instead of the only one.