I've played quite a few games with this "sonar" mechanic, some that were small adventure games, most that were horror, and yours is hands down the most beautifully executed I've come across. A lot of games fall short in that they use sound in this way more as a gimmick and it detracts from proper storytelling and level design. You handled it well and the result was a game I couldn't put down. Love the atmosphere, the voice work, and the gorgeous expanding areas. I featured it as a bonus game in my latest list. Great job to all the students who contributed!