An excellent composition. High level recording for both the violin and cello parts. I really appreciate the quality of everything here. Excellent use of dynamics overall. I love it when a piece containing sampled instruments effectively employs a wide range of dynamics. Though from around 2:26 to 2:50 or so, it the crescendo/decrescendo thing you've got going on sounds a bit forced and less natural. However, it still achieves its intended effect.
I understand this is intended to be more of a "demo" for the film, so with that in mind, I note some themes just falling off in what feels like the middle of a phrase (like at 2:11 and 3:55). This could make perfect sense when applied to a film, but as a standalone piece you lack a few transitions.
This is top notch work. You have a lot of talent. I'm going to check out your other stuff, and I'm very interested to hear what else you'll come up with! You'll be a contender here on NG.