To answer your question, this game was probably too hard. I only managed to find 2 people and I couldn't find a rescue point. Not having anything to guide you towards survivors meant I was just wandering aimlessly. The water effects and ambiance were nice though and it felt claustrophobic and stressful. I also liked the intro segment and the tutorial at the beginning being given over the phone was a nice touch.
The reset button also didn't reset the timer for me so it just immediately ran out again.