My biggest complaint is that it's too short. I understand the need for tightening up the story, but I feel it may have been too much.
The other minor issue I had with it is the combat scenes. It's obviously very difficult to portray a melee fight scene with audio only, but I think there's definitely some room for tweaking.
Overall though, I loved listening to this. The music is great, voices, sound effects, etc. I look forward to more!