It's a small movie, for sure. But I really liked it. The nicest aspect is its originality. You haven't seen this story before, it's not a rehashing of two dozen movies you've seen before. It can be read as a metaphor of human pain and loss, but you are trapped by the narrative from start to finish. It's a nice small flick!
At the moment I'm writing this review, it is scored 5.4. It pretty much reflect what it does worth. I personally put a solid 6 on it. I found it entertaining and fun. Don't think you'll get great special effects, here, people flying all over the place, explosions, explicit gore, Godzilla-like creatures crushing cities, etc. Yet, it's well shot, the photography is nice with deep colors, it is well played through and through, and at the risk of revealing too much, you have a decent mix of heartfelt moments and action. A very decent film.
For reference, I score 6 for entertaining; 5 for entertaining with reservations; 7 for VERY entertaining movies.