Had amazing potential, makes absolutely no sense

Rating: 3/10 (9 April 2018)

First, I enjoyed some parts of this film. The suspense was on point. Acting was good. It wasn't totally unwatchable but for me, it fell short of what it could have been. I'm just going to list why I disappointed and confused.
Spoilers below:

are they really aliens? How did they get here? They look and act like violent creatures with only one purpose to kill everything that makes noise, how would that attitude and intellect allow for interstellar travel?
how does a shot gun to the head kill it if it's indestructible, come on now we have weapons on earth that would crush these things in seconds.
of course ultrasonic sound is gonna freak it out if small sound attracts it, it really takes over a year to figure that out?
where's the beginning ? And ending? It Just dumps us in the middle.
why would you have a baby in this post apocalyptic world? And what do you do when the kid starts screaming? A box?
they could have lived by the waterfall if they could scream by it.
lastly everything on this planet makes noise, trees falling in the woods, rain on the ground, the damn wind. But these things can hear a picture drop on the floor and immediately show up to kill you? Ridiculous.

Would have been a great movie with more thought behind it. But I did feel robbed leaving the theater.