Great concept, making the player themselves count down to avoid getting caught. At first, I couldn't see the point because I was using the ticking to time the countdown, but the first time that the ticking sped up, I felt really unsettled that I didn't know how much time I had anymore. An "endless" mode I think would be tons of fun, or maybe a mode where you're being chased by a monster down the corridor. Keep up the great work!