Ill post here all my suggestions(so they will be in on theard and not spaming 'em)
- When creating a new race,make them unlockable by wealth(don't make them OP tho,just different playstyle)
- make dragon twice in price,because they are roflstompers,and when u get even one - wealth will go easly,not to mention,that they making huge advantage in PvP.even green one can burn 1-2 unit pack
- make ponies as an elite unit (this is optional tho

)
- make healing in NPC town avalibale even if u dont have full sum,but will heal depends on how much u will pay from it (if full heal 2K and u pay 1K then you will be healed by 50%)
- make heal costs by amount of HP,not flat $ per %