spoiler
Hmm.... so the creatures proved to be robotic - programmed.
I can see the cabal doing something of that sort - and the 90% reduction of human population is something various globalist organizations have suggested a few times (club of rome, for instance).
This movie suggests, however, that controllers come from space (post-credits scene). I'm guessing that this goes into the ancient aliens theory territory. Oh, and then there's this loosh theory - earth being a farm - where human beings are akin to cattle without ever realizing it - and loosh (negative emotional energy) is being farmed, and events perpetually causing human beings to experience negative emotions are all largely orchestrated. Though why they'd want to exterminate 95% of humanity makes little sense - as I imagine they'd want to keep the farm going in perpetuity.
Anyways - just providing some backdrop to what this whole thing could be.
As far as the film is concerned, however.... there are a lot of, what I'd call, logical fallacies. You'd think that after several years, people would start building bridges between mountains - and/or design various tools for flying/gliding, to go between various mountains - not all require high tech.
All in all, there are a lot of very interesting conspiracy theories out there - plenty of material for making great sci-fi - but it all has to be well done. This films wasn't it - 5/10.
I do like the direction of the premise - these theories do need to be explored - but you need to execute it well - and provide appropriate explanations.