Strictly from a color standpoint I think overall exposure was good, but if you want to creatively color grade I recommend shooting with a flat profile then using a creative LUT in post. For this type of footage I would have enhanced the contrast, pushed the lows lower, given it all a colder color temp and since vignettes are in these days, given it a slight vignette.
From a composition and content standpoint, I think it was pretty good, but people have short attention spans these days, so instead of all big picture shots I would have mixed it up with some closeups, get closer to the tree tops, shoot some rising footage while taking off to reveal the view as the drone rises, instead of a pan up over the dam, do an orbit, even a half orbit would have presented well, get some footage from in the forest maybe following a foot path. An easy shot to set up that always presents well is to try to get the sun coming through the trees then truck left or right possibly with a slight rising or tilting action to add multi-axis dimensionality to the scene. Also, a good rule of thumb is don't let any single clips run longer than 5-8s without a viewpoint change or different subject material.
Unfortunately, the more interesting the footage is to the viewer, the more dangerous it was for the drone to acquire. I definitely liked the video, but since you asked for feedback I gave my .02.