It does a decent job at establishing the setting and the characters. Despite it not being tagged as a horror movie, it certainly takes on a lot of the horror-like cinematography once the action kicks in. Despite the acting being really bland, the characters feels believable as they talk and act realistically - except to obviously progress the plot. The pacing was rather good, with not much downtime from impactful events or dialogue. But it lacked the suspense completely... Potentially because it is too mysterious to even speculate what is behind the corner.
The primary aspect that might be taken issue with is definitely the conclusion. It certainly undermined the joy of trying to figure out who the antagonist is, as it is rather unpredictable. But this served the movie much better than giving too many hints and ruin the conclusion. Furthermore, it becomes the most fulfilling moment of the movie - as a conclusion should be - but does so in a unique manner. It definitely could have been executed in a more thoughtful manner, with extended knowledge prior to the conclusion as a potential solution to make it a much more touching ending.
The primary aspect that might be taken issue with is definitely the conclusion. It certainly undermined the joy of trying to figure out who the antagonist is, as it is rather unpredictable. But this served the movie much better than giving too many hints and ruin the conclusion. Furthermore, it becomes the most fulfilling moment of the movie - as a conclusion should be - but does so in a unique manner. It definitely could have been executed in a more thoughtful manner, with extended knowledge prior to the conclusion as a potential solution to make it a much more touching ending.