I agree that the rapids are quite nice. The two little secret paths in the north look like they should contain something, an item or a creep.
Rework the edges of the terrain a bit, having trees that suddenly stop is jarring.
Maybe have the Silver Hand unit's camp be hidden at the beginning.
The doom guard dies very quickly, maybe make it slightly longer?
As I don't know what you're planning to do with the rest, I'll just say that if you don't have voice-acted lines for evey single cinematic, you're better off haaving none at all (it's very disturbing to have some scenes spoken and others not, all or nothing works best on this).