*Delnar_Ersike claps that lolje is back working on the project now. Danke schoen!

edit:
about the mounted units being too strong, I had an idea to decrease riders' attack. Also, in the smithy, there should be some "special" upgrades along with the "boring" (+1 health, +1 damage, etc) upgrades. Upgrades like infantry do 150% damage vs riders and hunters (pikemen), archers get +1 range (longbowmen), riders get +1 damage if they moved two squares before attacking (charge), hunters can spend movement points after they attacked (tactics), and you can convert miners or loggers into recruits after the enemy has attacked you at the cost of an extra 50 wood and 10 gold per recruit (drafting).
You may also add branching in techs, meaning there are two techs but you can only research one out of them. Branching techs like the choice between longbowmen (the range bonus) or crossbowmen (+1 extra damage) and the choice between pikemen (the bonus vs mounted units) or swordsmen (150% bonus vs foot soldiers).
If there is space in the interface, you may add damage reduction (armor), where the unit receives less damage but always receives at least 1 damage from attacks.

Hope that wasn't too many suggestions for smithy for you to handle, lolje. When I start dreaming, I can't stop .