I will add an overall level on top of the ingame level where you can invest skillpoints to get nice buffs.
What do you think about these:
Economy:
1. Start with 5 more wood, stone and food.
2. You can carry one more resource by default.
3. You get one more resource from harvesting yourself.
4. Your chance to get iron from the quarry is now 100%. (Otherwise 30% chance)
5. All resources are worth 25% more when selling them and 25% cheaper when buying them.
6. All your units get 1 more resource per workcycle.
Character:
1. Start with max. health- and manapotions.
2. Your abilities cooldowns are 10% shorter.
3. To skill yourself costs 20% less gold.
4.Increases your max. level by 5.
5. Increases your max health by 10%.
6. Increases your damage by 15%.
Army:
1. Military units move faster.
2. Recruiting military units is 10% cheaper.
3. Range units have an higher range.
4. The blacksmith is 10 sec. faster per upgrade.
5. Military units have 5% more max. health.
6. Military units deal 10% more damage.
The skill window will be in the character customization menu and look something like this:
