In the hero selection Grom (neutral) is already level 2, while Thrall (neutral) is level 1. When selecting heroes, the neutral heroes that are before a circle of power are usually level 1.
Grom has the pillage ability but no way to research pillage to be able to use it and even if he could there is no reason to research pillage as there is no way to spend gold or lumber. I suggest you remove the pillage ability from Grom.
Some orc buildings are not enemy , maybe they all have to be enemy. the ones in the dirt to the right of the map.
thrall's moonsoon sucks, it needs change, imho...
the last boss's stun does lots of dmge and stuns... grom has a way easier time killing him cuz of avatar, maybe give thrall some more power...
the ending is kind of a let down. good first cinematic with the peon. maybe do something like that... or have some text appear... something like "now you are warchief of the horde!" or something like that... maybe add some human flare effects to the background or grunts cheering or something...
"...huts or tents" yes, I think it is mandatory to find those if you are Thrall. maybe, if you are grom you can do without , but thrall... thrall needs some power.
I ' ll gladly check the updated version out!