"La Entidad" is well shot, well acted, and most of the special effects are decent. The story had potential, as did the twist, but it quickly becomes repetitive and easy to predict.
There is next to no variation in the scary parts. The same thing just happens over and over and over again to the point where you become desensitized. It loses all effectiveness before the halfway point. Clearly, the creators had a good idea for a premise but should have spent more time fleshing out the script.
Another case of a half-baked feature length found footage film that should have only been about 45-50 minutes long.
Another thing that bothered me was that nearly every time the camera cuts to another POV or scene, there is a quiet burst of digital white noise. It got annoying really quickly and served absolutely no purpose. Also, the sound of the entity was not mixed into the audio well. It was clearly just digital effects added in post. There is a way to make it seem like its actually happening within the world of the movie, but it was just your typical "spooky whispering" with lots of reverb and cliche monster noises slapped on top of the recorded audio.
Not terrible, but kind of a waste of time.