Let's get started.
I like what you did. The melodies are nice and gentle, the mixing is good and the overal composition isnice too.
Although you're using kinda unrealistic samples, another reason why this maybe sounds a bit unrealistic is because the brass in the background is a lot softer than (for instance) the flute solo, which would be kinda impossible when performed with a real orchestra. Because the timbre of the brass is really sharp (which means they play loud) they should be loud too in the mix. But in a video game context, this wouldn't matter that much.
Those trumpets in the end are a bit too loud though, you can hear that the samples aren't really that good.
Other than that, good job