Yeah, it wasn't great.

Rating: 7/10 (8 August 2018)

Just kinda stupid.
Want to beat these monsters? Spend a day quietly putting big spears around you and yell loudly. Oh, tough enemy.
Want to beat these monsters? Stand near a big electrical fault and yell. Run away. They'll die.
The fact that high pitched sound is the solution was moronic. Did no one else on Earth think of that? Did all the smart people die first?
Edit; Bonus point for having the idiot child killed at the start. Otherwise, I'd give this a six.