Hello!
The idea of a faction of boneman/skeletons is always cool.

The terrains it's good, but can be improved.
I have to agree with Mamal about the death pact, looks like this skeletons aren't cannon fodder and you can't just sacrificed one in this chapter.
The catapult of the skeletons throw meat rather that bones.
What is the point to speak with the optional skeleton? Something in the future?
About bugs:
-A bug that could happen, is that the cinematic that show you the enemy base, your units can walk in middle of the cinematic (and die in a horrible way).
-The rune of resurrection that drop the optional boss doesn't work because the skeletons lacks of corpse, maybe replace it with rune of restauration?
Everything else is fine. I hope to see the campaign, I really hope that get crazy