I hope it's clear how much I enjoyed the ingenuity, simplicity, and elegance of your mechanic. I liked how I could tap the objects and walls as well as the floors, too. Maybe taking a page from visual aids in public, use 3d/directional sound sources as navigation aids, a sort of audio hot/cold approach, might help with getting lost? There's a lot sound could do to compliment what you've done already, should you want to implement it. Yikes, nice save on the menu buttons, I was able to (and did) play all 3 levels regardless. Even if there's no combat to be had, the promise and execution of exploration and navigation that Completely Dark suggests remains truly fascinating.