All things are good so I'll cut to the only two issues:
1.
The camera shake went too far.
It's trying to give a documentary vibe, but for those of us who have watched quite a lot of documentaries, the problem sticks out pretty obviously.
The cameraman was DELIBERATELY SHAKING the camera, while in real documentaries, cameramen FAILS TO KEEP the camera stable. That's a huge difference if you examine it in detail.
2.
The ending sucks.
I've heard two different explanations. Some say it's for the censorship. Some say the company required it to the director.
Either way, it's horrible. As we say in Chinese, like adding legs to a snake painting.