Hello again!
This plugin uses the controls associated with the Direction keys. Currently, it does not have exclusive functionality for touch devices. I don't know how RPG MAKER MZ handles this function. I guess some plugin that remaps the Direction keys to touch events should work, but honestly I'm not sure about that.
In general, my plugins will always be focused on Keyboard and joystick devices as these are the devices I work.
I send you my regards! I hope I have solved your question. All the best!
Sincerely, Maxii1996 | Undermax Games