I really like this, however, I always pick the same three, PUs, Food, Wood, and vary the 4th, but always a unit building resource. Maybe reduce the unit resources to make them less attractive.
Muster Elite Cavalry is way too expensive so I will never buy it.
Another option for spending XP could be for every race to buy one Hero with leadership abilities.
Could they be created where there are woods and no Factory?
My take on Siege Engines is most have an attack and no defence, but the Night Elf Scorpid would have attack and defence.
Manabots, Mana is too expensive, I buy them cause I cannot buy anything else with the mana surplus.
Have 5+1+1=7 unit production centres/Factories, in keeping with other races, Darnassus perhaps to 3, or if you must 4. Night Elves can build a Fleet twice as quick as other races and the sea has a lot of resources. (The Gnomes also have access to 2 ports, but that is countered by the Pirates, in the early game.
I created the Ceremonial Fire, the following turn it disappears and is replaced with 3 wisps. Is this how its supposed to work?
Mountain Giant, is poor value, maybe 75 mana or less? Mana is too expensive, I buy them cause I cannot buy anything else with the mana surplus.
This is an awesome game and Im having loads of fun.
But Sieging the capitals is too easy, they dont feel like sieges.
Would you consider having say walls that must be destroyed first by Siege Engines and bombers?
Maybe degrading the Factory from a 5 to 4 to 3 etc?
Aircraft are too good at Bombing, they can stop a capitals production.
It seems strange that when a capital falls to the enemy it retains its full factory output and the enemy can use it next turn,
A random suggestion
All mana based units could be 'summoned' by casters/heroes instead of appearing at a Factory.