I actually didn't pick up the sound cues as a hint until i see the credit scene- where you credited sound effects for the hiding places lol
After that, the game became really fun fast! It is a great gameplay loop. In addition, the visuals are subtle but effective addition-the visual change when you put your phone somewhere, and the animations are great.
Nothing to complain about in audio-after all, it is the core mechanic of the game and you did it quite well.
Nice job!