In my opinion, this game has a great action taste. But control/moving using only mouse is not satisfied enough. Unlike the other rpg games in the earlier years, that did not focus on dodging to limit the damage the player takes from mobs.
The dash from the space bar in combination with a mouse click won't make me comfortable than using the WASD movement control.
Let the players to toggle mouse mode or keyboard mode in the settings. An option to choose.