Welcome to the game!
I comment that it really seemed strange to me that the leveling up did not increase the statistics as in other games, but I noticed the constitution affecting the HP, but it also happens with luck and its effect on the probability of making a critical attack. Although something happens that I do not understand, while the character levels up it also seems that the probability drops a little each time, I still do not know how that works.
Do you mean the luck stats? It actually changes based on your opponent's level.
thanks for the explanation.