This movie has somehow two different versions. The one available on Alter's YouTube channel is so much better than the other on the director's official YouTube channel quite honestly. It's because the version on Alter's channel much more focuses on the sound design, and the score is more sparingly and appropriately used, which heighten the tension in each scenes and I love it. I have no idea why there are two different versions, but I'm very happy that I watched the both anyway. Everybody should definitely check it out.