It all felt like someone strung up all the scenes from a game to make a story. I asked myself if it were fan made. The animation wasn't only weak, it was slow. The whole thing's an hour long, but at what I consider normal speed, it's probably more like 45 minutes. I watched at 2x and it was OK. Also there were some scenes that were perfect candidates for eye candy, like the explosions of ships and the fights. They had no budget for those.
Now, about the story, it's an origin story of this character in a game called Halo that I have never played or seen played, so I can only comment on it as an independent thing. Young children are abducted and turned into supersoldiers just in time to fight an aggressive alien species. I don't know why they called it The Fall or Reach, since nothing fell. Just as I was getting invested in the story the film ended.
Bottom line: nothing spectacular, not in terms of production or storyline, but it is an animation probably made using a game engine for a novel written for that game. What did you expect?