The scenario was more than stupid.
SPOILERS:
At one point in the movie they agree that they should leave their military outpost by car after being attacked by the creatures (this is a smart decision) but one guy say that if they leave they will be killed by insurgents on their way out. However, at the end of the movie, after 90% of them are dead, they left by...you guess what .....a car.
One man got stuck in a bunker full of creatures, there's 100% chance he will die, but the heroin gather everyone left to rescue him...in the end everyone die except that guy and her.
The creatures seems to target the heroine with some weird tentacles. We don't know why and it's not explained in the movie.
There's also a giant monster at the base of the bunker, we don't know why he's here and we won't see anything more about it.
I'd write a better scenario while drunk and on drugs. Don't waste your time watching it.