There are a couple of minor flaws. I think too many heroes add stats. That's not good – it's boring. Perhaps a couple of interesting abilities would improve the situation.
Cutness. Initial-advanced-highest-perfect. 10-20-30-40% of the enemy army dies before the battle from being overwhelmed with cuteness.
Otherwise, there are practically no complaints. I also suggest introducing some kind of building that gives a 100% bonus to the main ability. Perhaps a tear of Ashi could provide this bonus?