I still don't know how many endings RunaMaw will have, but at the moment the plan is to only have one.
Mid fight variations based on party members is not possible, but two of the new scenes have variations based on what you do.
being Ame Yin (If you have enough money or not)
And Minty (If you fight or not.)
You're the first person to say the game is easy, most say is fine or that is grindy, I think the difficulty as a whole is fine, I do agree with the statues however, which is why I changed them in the new update to have them do a charge skill before the attack so the player can better react to them <3