Good job
This is a very in depth and good game overall. I found mission 4 too much of a difficulty curve and would have been better placed later on because of the staggering toughness of the giant in the back, if there was a command to make your units defend it would be well placed since then you could keep your units from hitting him. The seemingly best strategy on easy is to spam warriors with your beginning mana. Then speed them up with haste, use rage, and heal occasionally and redo when it wears out.