Seriously, is there one?
I think it would help if there was one.
Anyway, here's my suggestions:
1. The exp, double it once more! and I think that would satisfy "the people" who claim it's still hard. Though I think at this exp rate, at higher levels, the exp gain would be too little.
2. Why isn't there any [Fist Type] weapons? Delivering earth shattering, heaven piercing, universe dividing blows should be normal for an oni.
3. More hairstyles for the men. Lel, I heard people saying that men lack hair.
Although my main objective is the suggestion parts, I put in my suggestions as well.