A real oddball this one, about a guy marooned in a one man space station in orbit above earth. One day earth decides to stop calling him, and we never really learn why. That leads to the first thing that bugs me - our hero never makes a serious attempt to find out why. Simply looking out the station window over the night side could have told him if the city lights were still on, if people were still there. While I'm moaning about obvious mistakes there's also the fact that he's shown running on a treadmill (without elastic straps), and he's shown scurrying about the station even after power failures, looking for all the world as if he has gravity. But, the outside of the station is shown several times and it appears to be no different from the ISS today - e.g. no spinning sections. So fiction this may be, but lets not confuse it with science fiction just because of the setting.
It quite self consciously evokes past scifi classics as it goes. Specifically brought to mind were Solaris (original Tarkovsky version), Silent Running, and 2001. In fact the ending of this movie is pretty much a speeded up rip/homage to the ending of 2001. However I won't say too much more on that for fear of spoiling it. My thoughts at the time were that homage is ok, but it kind of reminded me that those were all much better movies which did actually have a decent story to tell.
The American Civil war intro scenes appeared to have crept in from a different, higher budget movie - did they? While admittedly intriguing (or confusing!) they ultimately seemed to add nothing of importance, though I guess they were intended to serve the same purpose as the Dawn Of Man sequence in 2001.
It is beautiful, and the director certainly knows how to film a tight dramatic close-up and throw in the oddball visual. I'm sure both he and his actor will go on to great things, but he needs better scripts.