What your mod brings to the table is really excellent, bringing in racial diversity, more starting equipment, and unique items to be found.
Impressions from some of the games I've played....
Angels; Not sure why they are banned from Path of the Gov, would have thought they'd be banned from Assassin.
Elves; Well balanced, love the Secret Paths trait, don't know why they can't build basic Hedge Walls
Shadows; Their inherent +5 move combined with Charge is sick. A bit OP in my opinion. The population hit doesn't balance out all the perks they have. With the crazy move/charge, don't even know why you gave them a specialized mount. It's like gilding the Lily.
Death Legion; I like them, was unplayable with a custom sovereign after change to Pioneer/Pop changes.
Drota; These were fun to play. Wish Stardock was a bit more forward thinking about creature types
Frost Giants; Had a lot of fun with these, really felt unique
Golems; I like to blend/tweak these with the Arcane Artificer Mod. Not sure why Golems have mounts
** River Improvements were an excellent idea **
You could consider something like the Heroes Mod where your Sovereign/Champion gets an optional Path to follow rather
than the pre-determined tree path
I know you set the Monster Spawn generators (Wolfmen, Halfdrakes, etc) to only producing a single unit. Really wish this
had a default values of 4+2 Units for each advancement of the monster camp tech. Not much incentive on the Tech Tree
when you know the yield is only 1+1 unit(s). It's not like these were spawning something game changing like Dragons.
Some of your pre-made Sovereigns start better off than can be designed through the create character option.
Take a look at Lochean (Golems). He basically has 2 additional points that can't be replicated by custom
design. Vini (Centaur) has Ice Spear (costing 1) and Basic Shield (costing 0), both items unavailable normally.
Animal Spirit: Walkabout was a neat idea, but the execution on summoning feels like it takes forever when comparing, say,
summoning an Elemental. I parked 2 turns and got a basic wolf. Yay?